Revert "Try move back to 19 and add sha512"

This reverts commit 90f76ab7.

pom.xml

@@ -27,7 +27,7 @@
     <parent>
         <groupId>org.apache</groupId>
         <artifactId>apache</artifactId>
-        <version>19</version>
+        <version>21</version>
     </parent>
 
     <developers>
@@ -407,36 +407,6 @@
                     </execution>
                 </executions>
             </plugin>
-            <!-- calculate checksums of source release for Apache dist area -->
-            <plugin>
-              <groupId>net.nicoulaj.maven.plugins</groupId>
-              <artifactId>checksum-maven-plugin</artifactId>
-              <version>1.7</version>
-              <executions>
-                <execution>
-                  <id>source-release-checksum</id>
-                  <goals>
-                    <goal>files</goal>
-                  </goals>
-                </execution>
-              </executions>
-              <configuration>
-                <algorithms>
-                  <algorithm>SHA-512</algorithm>
-                </algorithms>
-                <csvSummary>false</csvSummary>
-                <fileSets>
-                  <fileSet>
-                    <directory>${project.build.directory}</directory>
-                    <includes>
-                      <include>${project.artifactId}-${project.version}-source-release.zip</include>
-                      <include>${project.artifactId}-${project.version}-source-release.tar*</include>
-                    </includes>
-                  </fileSet>
-                </fileSets>
-                <failIfNoFiles>false</failIfNoFiles><!-- usually, no file to do checksum: don't consider error -->
-              </configuration>
-            </plugin>
         </plugins>
     </build>