Bump maven-pmd-plugin from 3.12.0 to 3.13.0 (apache#44)

Bumps [maven-pmd-plugin](https://github.com/apache/maven-pmd-plugin) from 3.12.0 to 3.13.0.
- [Release notes](https://github.com/apache/maven-pmd-plugin/releases)
- [Commits](apache/maven-pmd-plugin@maven-pmd-plugin-3.12.0...maven-pmd-plugin-3.13.0)

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Author: dependabot[bot]

pom.xml

@@ -295,7 +295,7 @@
       </plugin>
       <plugin>
         <artifactId>maven-pmd-plugin</artifactId>
-        <version>3.12.0</version>
+        <version>3.13.0</version>
         <configuration>
           <targetJdk>${maven.compiler.target}</targetJdk>
         </configuration>