Bump org.codehaus.mojo:jdepend-maven-plugin from 2.0 to 2.1

Bumps [org.codehaus.mojo:jdepend-maven-plugin](https://github.com/mojohaus/jdepend-maven-plugin) from 2.0 to 2.1.
- [Release notes](https://github.com/mojohaus/jdepend-maven-plugin/releases)
- [Commits](mojohaus/jdepend-maven-plugin@jdepend-maven-plugin-2.0...2.1)

---
updated-dependencies:
- dependency-name: org.codehaus.mojo:jdepend-maven-plugin
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

pom.xml

@@ -30,7 +30,7 @@
         <findbugs.version>3.0.5</findbugs.version>
         <javadoc.version>3.10.0</javadoc.version>
         <pmd.version>3.25.0</pmd.version>
-        <jdepend.version>2.0</jdepend.version>
+        <jdepend.version>2.1</jdepend.version>
         <javancss.version>2.0</javancss.version>
         <project.info.version>3.7.0</project.info.version>
         <jxr.version>3.5.0</jxr.version>