[FLINK-20906][legal] Update copyright year to 2021 for NOTICE files.

This closes #14598

NOTICE

 Apache Flink
-Copyright 2014-2020 The Apache Software Foundation
+Copyright 2014-2021 The Apache Software Foundation
 
 This product includes software developed at
 The Apache Software Foundation (http://www.apache.org/).

flink-connectors/flink-connector-cassandra/src/main/resources/META-INF/NOTICE

 flink-connector-cassandra
-Copyright 2014-2020 The Apache Software Foundation
+Copyright 2014-2021 The Apache Software Foundation
 
 This product includes software developed at
 The Apache Software Foundation (http://www.apache.org/).

flink-connectors/flink-connector-elasticsearch5/src/main/resources/META-INF/NOTICE

 flink-connector-elasticsearch5
-Copyright 2014-2020 The Apache Software Foundation
+Copyright 2014-2021 The Apache Software Foundation
 
 This product includes software developed at
 The Apache Software Foundation (http://www.apache.org/).

flink-connectors/flink-connector-hive/src/main/resources/META-INF/NOTICE

 flink-connector-hive
-Copyright 2014-2020 The Apache Software Foundation
+Copyright 2014-2021 The Apache Software Foundation
 
 This product includes software developed at
 The Apache Software Foundation (http://www.apache.org/).

flink-connectors/flink-connector-kinesis/src/main/resources/META-INF/NOTICE

 flink-connector-kinesis
-Copyright 2014-2020 The Apache Software Foundation
+Copyright 2014-2021 The Apache Software Foundation
 
 This product includes software developed at
 The Apache Software Foundation (http://www.apache.org/).

flink-connectors/flink-connector-twitter/src/main/resources/META-INF/NOTICE

 flink-connector-twitter
-Copyright 2014-2020 The Apache Software Foundation
+Copyright 2014-2021 The Apache Software Foundation
 
 This product includes software developed at
 The Apache Software Foundation (http://www.apache.org/).

flink-connectors/flink-sql-connector-elasticsearch6/src/main/resources/META-INF/NOTICE

 flink-sql-connector-elasticsearch6
-Copyright 2014-2020 The Apache Software Foundation
+Copyright 2014-2021 The Apache Software Foundation
 
 This product includes software developed at
 The Apache Software Foundation (http://www.apache.org/).

flink-connectors/flink-sql-connector-elasticsearch7/src/main/resources/META-INF/NOTICE

 flink-sql-connector-elasticsearch7
-Copyright 2014-2020 The Apache Software Foundation
+Copyright 2014-2021 The Apache Software Foundation
 
 This product includes software developed at
 The Apache Software Foundation (http://www.apache.org/).

flink-connectors/flink-sql-connector-hbase-1.4/src/main/resources/META-INF/NOTICE

 flink-sql-connector-hbase-1.4
-Copyright 2014-2020 The Apache Software Foundation
+Copyright 2014-2021 The Apache Software Foundation
 
 This product includes software developed at
 The Apache Software Foundation (http://www.apache.org/).

flink-connectors/flink-sql-connector-hbase-2.2/src/main/resources/META-INF/NOTICE

 flink-sql-connector-hbase-2.2
-Copyright 2014-2020 The Apache Software Foundation
+Copyright 2014-2021 The Apache Software Foundation
 
 This product includes software developed at
 The Apache Software Foundation (http://www.apache.org/).

flink-connectors/flink-sql-connector-hive-1.2.2/src/main/resources/META-INF/NOTICE

 flink-sql-connector-hive-1.2.2
-Copyright 2014-2020 The Apache Software Foundation
+Copyright 2014-2021 The Apache Software Foundation
 
 This product includes software developed at
 The Apache Software Foundation (http://www.apache.org/).

flink-connectors/flink-sql-connector-hive-2.2.0/src/main/resources/META-INF/NOTICE

 flink-sql-connector-hive-2.2.0
-Copyright 2014-2020 The Apache Software Foundation
+Copyright 2014-2021 The Apache Software Foundation
 
 This product includes software developed at
 The Apache Software Foundation (http://www.apache.org/).

flink-connectors/flink-sql-connector-hive-2.3.6/src/main/resources/META-INF/NOTICE

 flink-sql-connector-hive-2.3.6
-Copyright 2014-2020 The Apache Software Foundation
+Copyright 2014-2021 The Apache Software Foundation
 
 This product includes software developed at
 The Apache Software Foundation (http://www.apache.org/).

flink-connectors/flink-sql-connector-hive-3.1.2/src/main/resources/META-INF/NOTICE

 flink-sql-connector-hive-3.1.2
-Copyright 2014-2020 The Apache Software Foundation
+Copyright 2014-2021 The Apache Software Foundation
 
 This product includes software developed at
 The Apache Software Foundation (http://www.apache.org/).

flink-connectors/flink-sql-connector-kafka/src/main/resources/META-INF/NOTICE

 flink-sql-connector-kafka
-Copyright 2014-2020 The Apache Software Foundation
+Copyright 2014-2021 The Apache Software Foundation
 
 This product includes software developed at
 The Apache Software Foundation (http://www.apache.org/).

flink-connectors/flink-sql-connector-kinesis/src/main/resources/META-INF/NOTICE

 flink-sql-connector-kinesis
-Copyright 2014-2020 The Apache Software Foundation
+Copyright 2014-2021 The Apache Software Foundation
 
 This product includes software developed at
 The Apache Software Foundation (http://www.apache.org/).

flink-dist/src/main/resources/META-INF/NOTICE

 flink-dist
-Copyright 2014-2020 The Apache Software Foundation
+Copyright 2014-2021 The Apache Software Foundation
 
 This product includes software developed at
 The Apache Software Foundation (http://www.apache.org/).

flink-examples/flink-examples-build-helper/flink-examples-streaming-state-machine/src/main/resources/META-INF/NOTICE

 flink-examples-streaming-state-machine
-Copyright 2014-2020 The Apache Software Foundation
+Copyright 2014-2021 The Apache Software Foundation
 
 This product includes software developed at
 The Apache Software Foundation (http://www.apache.org/).

flink-filesystems/flink-azure-fs-hadoop/src/main/resources/META-INF/NOTICE

 flink-azure-fs-hadoop
-Copyright 2014-2020 The Apache Software Foundation
+Copyright 2014-2021 The Apache Software Foundation
 
 This project includes software developed at
 The Apache Software Foundation (http://www.apache.org/).

flink-filesystems/flink-fs-hadoop-shaded/src/main/resources/META-INF/NOTICE

 flink-fs-hadoop-shaded
-Copyright 2014-2020 The Apache Software Foundation
+Copyright 2014-2021 The Apache Software Foundation
 
 This project includes software developed at
 The Apache Software Foundation (http://www.apache.org/).

flink-filesystems/flink-oss-fs-hadoop/src/main/resources/META-INF/NOTICE

 flink-oss-fs-hadoop
-Copyright 2014-2020 The Apache Software Foundation
+Copyright 2014-2021 The Apache Software Foundation
 
 This project includes software developed at
 The Apache Software Foundation (http://www.apache.org/).

flink-filesystems/flink-s3-fs-hadoop/src/main/resources/META-INF/NOTICE

 flink-s3-fs-hadoop
-Copyright 2014-2020 The Apache Software Foundation
+Copyright 2014-2021 The Apache Software Foundation
 
 This project bundles the following dependencies under the Apache Software License 2.0 (http://www.apache.org/licenses/LICENSE-2.0.txt)
 

flink-filesystems/flink-s3-fs-presto/src/main/resources/META-INF/NOTICE

 flink-s3-fs-presto
-Copyright 2014-2020 The Apache Software Foundation
+Copyright 2014-2021 The Apache Software Foundation
 
 This project includes software developed at
 The Apache Software Foundation (http://www.apache.org/).

flink-filesystems/flink-swift-fs-hadoop/src/main/resources/META-INF/NOTICE

 flink-swift-fs-hadoop
-Copyright 2014-2020 The Apache Software Foundation
+Copyright 2014-2021 The Apache Software Foundation
 
 This project includes software developed at
 The Apache Software Foundation (http://www.apache.org/).

flink-formats/flink-sql-avro-confluent-registry/src/main/resources/META-INF/NOTICE

 flink-sql-avro-confluent-registry
-Copyright 2014-2020 The Apache Software Foundation
+Copyright 2014-2021 The Apache Software Foundation
 
 This product includes software developed at
 The Apache Software Foundation (http://www.apache.org/).

flink-formats/flink-sql-avro/src/main/resources/META-INF/NOTICE

 flink-sql-avro
-Copyright 2014-2020 The Apache Software Foundation
+Copyright 2014-2021 The Apache Software Foundation
 
 This product includes software developed at
 The Apache Software Foundation (http://www.apache.org/).

flink-formats/flink-sql-orc/src/main/resources/META-INF/NOTICE

 flink-sql-orc
-Copyright 2014-2020 The Apache Software Foundation
+Copyright 2014-2021 The Apache Software Foundation
 
 This product includes software developed at
 The Apache Software Foundation (http://www.apache.org/).

flink-formats/flink-sql-parquet/src/main/resources/META-INF/NOTICE

 flink-sql-parquet
-Copyright 2014-2020 The Apache Software Foundation
+Copyright 2014-2021 The Apache Software Foundation
 
 This product includes software developed at
 The Apache Software Foundation (http://www.apache.org/).

flink-kubernetes/src/main/resources/META-INF/NOTICE

 flink-kubernetes
-Copyright 2014-2020 The Apache Software Foundation
+Copyright 2014-2021 The Apache Software Foundation
 
 This project includes software developed at
 The Apache Software Foundation (http://www.apache.org/).

flink-mesos/src/main/resources/META-INF/NOTICE

 flink-mesos
-Copyright 2014-2020 The Apache Software Foundation
+Copyright 2014-2021 The Apache Software Foundation
 
 This product includes software developed at
 The Apache Software Foundation (http://www.apache.org/).

flink-metrics/flink-metrics-datadog/src/main/resources/META-INF/NOTICE

 flink-metrics-datadog
-Copyright 2014-2020 The Apache Software Foundation
+Copyright 2014-2021 The Apache Software Foundation
 
 This product includes software developed at
 The Apache Software Foundation (http://www.apache.org/).

flink-metrics/flink-metrics-graphite/src/main/resources/META-INF/NOTICE

 flink-metrics-graphite
-Copyright 2014-2020 The Apache Software Foundation
+Copyright 2014-2021 The Apache Software Foundation
 
 This product includes software developed at
 The Apache Software Foundation (http://www.apache.org/).

flink-metrics/flink-metrics-influxdb/src/main/resources/META-INF/NOTICE

 flink-metrics-influxdb
-Copyright 2014-2020 The Apache Software Foundation
+Copyright 2014-2021 The Apache Software Foundation
 
 This product includes software developed at
 The Apache Software Foundation (http://www.apache.org/).

flink-metrics/flink-metrics-prometheus/src/main/resources/META-INF/NOTICE

 flink-metrics-prometheus
-Copyright 2014-2020 The Apache Software Foundation
+Copyright 2014-2021 The Apache Software Foundation
 
 This product includes software developed at
 The Apache Software Foundation (http://www.apache.org/).

flink-ml-parent/flink-ml-uber/src/main/resources/META-INF/NOTICE

 flink-ml-uber
-Copyright 2014-2020 The Apache Software Foundation
+Copyright 2014-2021 The Apache Software Foundation
 
 This product includes software developed at
 The Apache Software Foundation (http://www.apache.org/).

flink-python/src/main/resources/META-INF/NOTICE

 flink-python
-Copyright 2014-2020 The Apache Software Foundation
+Copyright 2014-2021 The Apache Software Foundation
 
 This product includes software developed at
 The Apache Software Foundation (http://www.apache.org/).

flink-runtime-web/src/main/resources/META-INF/NOTICE

 flink-runtime-web
-Copyright 2014-2020 The Apache Software Foundation
+Copyright 2014-2021 The Apache Software Foundation
 
 This product includes software developed at
 The Apache Software Foundation (http://www.apache.org/).

flink-runtime/src/main/resources/META-INF/NOTICE

 flink-runtime
-Copyright 2014-2020 The Apache Software Foundation
+Copyright 2014-2021 The Apache Software Foundation
 
 This product includes software developed at
 The Apache Software Foundation (http://www.apache.org/).

flink-table/flink-sql-client/src/main/resources/META-INF/NOTICE

 flink-sql-client
-Copyright 2014-2020 The Apache Software Foundation
+Copyright 2014-2021 The Apache Software Foundation
 
 This product includes software developed at
 The Apache Software Foundation (http://www.apache.org/).

flink-table/flink-table-planner-blink/src/main/resources/META-INF/NOTICE

 flink-table-planner-blink
-Copyright 2014-2020 The Apache Software Foundation
+Copyright 2014-2021 The Apache Software Foundation
 
 This product includes software developed at
 The Apache Software Foundation (http://www.apache.org/).

flink-table/flink-table-planner/src/main/resources/META-INF/NOTICE

 flink-table-planner
-Copyright 2014-2020 The Apache Software Foundation
+Copyright 2014-2021 The Apache Software Foundation
 
 This product includes software developed at
 The Apache Software Foundation (http://www.apache.org/).

flink-test-utils-parent/flink-test-utils/src/main/resources/META-INF/NOTICE

 flink-test-utils
-Copyright 2014-2020 The Apache Software Foundation
+Copyright 2014-2021 The Apache Software Foundation
 
 This product includes software developed at
 The Apache Software Foundation (http://www.apache.org/).

tools/releasing/NOTICE-binary_PREAMBLE.txt

@@ -4,7 +4,7 @@
 // ------------------------------------------------------------------
 
 Apache Flink
-Copyright 2014-2020 The Apache Software Foundation
+Copyright 2014-2021 The Apache Software Foundation
 
 This project bundles the following dependencies under the Apache Software License 2.0 (http://www.apache.org/licenses/LICENSE-2.0.txt)