Bump versions-maven-plugin from 2.8.1 to 2.9.0 (#60)

Bumps [versions-maven-plugin](https://github.com/mojohaus/versions-maven-plugin) from 2.8.1 to 2.9.0.
- [Release notes](https://github.com/mojohaus/versions-maven-plugin/releases)
- [Changelog](https://github.com/mojohaus/versions-maven-plugin/blob/master/ReleaseNotes.md)
- [Commits](mojohaus/versions@versions-maven-plugin-2.8.1...versions-maven-plugin-2.9.0)

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

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

pom.xml

@@ -168,7 +168,7 @@
         <groupId>org.codehaus.mojo</groupId>
         <artifactId>versions-maven-plugin</artifactId>
         <!-- Version 2.2 causes an NPE with Maven 3.3.9 -->
-        <version>2.8.1</version>
+        <version>2.9.0</version>
       </plugin>
       <plugin>
         <groupId>com.github.spotbugs</groupId>