Bump maven-pmd-plugin from 3.17.0 to 3.18.0 (#294)

Bumps [maven-pmd-plugin](https://github.com/apache/maven-pmd-plugin) from 3.17.0 to 3.18.0.
- [Release notes](https://github.com/apache/maven-pmd-plugin/releases)
- [Commits](https://github.com/apache/maven-pmd-plugin/compare/maven-pmd-plugin-3.17.0...maven-pmd-plugin-3.18.0)

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

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Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
diff --git a/pom.xml b/pom.xml
index 72b96d5..dda99e3 100644
--- a/pom.xml
+++ b/pom.xml
@@ -215,7 +215,7 @@
         <plugin>
           <groupId>org.apache.maven.plugins</groupId>
           <artifactId>maven-pmd-plugin</artifactId>
-          <version>3.17.0</version>
+          <version>3.18.0</version>
           <dependencies>
             <dependency>
               <groupId>net.sourceforge.pmd</groupId>