Bump maven-pmd-plugin from 3.20.0 to 3.21.0

Bumps [maven-pmd-plugin](https://github.com/apache/maven-pmd-plugin) from 3.20.0 to 3.21.0. - [Release notes](https://github.com/apache/maven-pmd-plugin/releases) - [Commits](apache/maven-pmd-plugin@maven-pmd-plugin-3.20.0...maven-pmd-plugin-3.21.0) --- updated-dependencies: - dependency-name: org.apache.maven.plugins:maven-pmd-plugin dependency-type: direct:production update-type: version-update:semver-minor ... Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

pom.xml

@@ -460,7 +460,7 @@ limitations under the License.
  <plugin>
  <groupId>org.apache.maven.plugins</groupId>
  <artifactId>maven-pmd-plugin</artifactId>
- <version>3.20.0</version>
+ <version>3.21.0</version>
  <configuration>
  <targetJdk>${maven.compiler.source}</targetJdk>
  <rulesets>