Update dependency org.apache.maven.plugins:maven-pmd-plugin to v3.21.2

Author: renovate[bot]

pom.xml

@@ -133,7 +133,7 @@
 				<plugin>
 					<groupId>org.apache.maven.plugins</groupId>
 					<artifactId>maven-pmd-plugin</artifactId>
-					<version>3.13.0</version>
+					<version>3.21.2</version>
 				</plugin>
 				<plugin>
 					<groupId>org.apache.maven.plugins</groupId>