[Misc] Update dragonwell version to 8.4.4

Summary: Update dragonwell version to 8.4.4

Test Plan: make.sh saint check

Reviewed-by: yuleil, kuaiwei

Issue: https://github.com/alibaba/dragonwell8/issues/115

dragonwell_version

 #
-# Copyright (c) 2019 Alibaba Group Holding Limited. All Rights Reserved.
+# Copyright (c) 2020 Alibaba Group Holding Limited. All Rights Reserved.
 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 #
 # This code is free software; you can redistribute it and/or modify it
@@ -19,5 +19,5 @@
 # Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 #
 
-DRAGONWELL_VERSION=8.3.3
-DRAGONWELL_JDK_UPDATE_VERSION=242
+DRAGONWELL_VERSION=8.4.4
+DRAGONWELL_JDK_UPDATE_VERSION=262