Bump org.apache.maven.plugins:maven-pmd-plugin from 3.21.0 to 3.21.2

Bumps [org.apache.maven.plugins:maven-pmd-plugin](https://github.com/apache/maven-pmd-plugin) from 3.21.0 to 3.21.2.
- [Release notes](https://github.com/apache/maven-pmd-plugin/releases)
- [Commits](apache/maven-pmd-plugin@maven-pmd-plugin-3.21.0...maven-pmd-plugin-3.21.2)

---
updated-dependencies:
- dependency-name: org.apache.maven.plugins:maven-pmd-plugin
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

pom.xml

@@ -433,7 +433,7 @@
       </plugin>
       <plugin>
         <artifactId>maven-pmd-plugin</artifactId>
-        <version>3.21.0</version>
+        <version>3.21.2</version>
         <configuration>
           <targetJdk>1.8</targetJdk>
         </configuration>