Bump org.apache.maven.plugins:maven-pmd-plugin in /p3c-pmd

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] <[email protected]>

p3c-pmd/pom.xml

@@ -36,7 +36,7 @@
         <versions-maven-plugin.version>2.16.1</versions-maven-plugin.version>
         <maven-source-plugin.version>3.3.0</maven-source-plugin.version>
         <maven-gpg-plugin.version>3.1.0</maven-gpg-plugin.version>
-        <maven-pmd-plugin.version>3.21.0</maven-pmd-plugin.version>
+        <maven-pmd-plugin.version>3.21.2</maven-pmd-plugin.version>
         <maven-compiler-plugin.version>3.11.0</maven-compiler-plugin.version>
         <maven-assembly-plugin.version>3.2.0</maven-assembly-plugin.version>
         <maven-javadoc-plugin.version>3.6.0</maven-javadoc-plugin.version>