Bump versions-maven-plugin from 2.9.0 to 2.15.0 (zalando#1428)

Bumps [versions-maven-plugin](https://github.com/mojohaus/versions) from 2.9.0 to 2.15.0.
- [Release notes](https://github.com/mojohaus/versions/releases)
- [Changelog](https://github.com/mojohaus/versions/blob/master/ReleaseNotes.md)
- [Commits](mojohaus/versions@versions-maven-plugin-2.9.0...2.15.0)

---
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>

logbook-parent/pom.xml

@@ -488,7 +488,7 @@
                 <plugin>
                     <groupId>org.codehaus.mojo</groupId>
                     <artifactId>versions-maven-plugin</artifactId>
-                    <version>2.9.0</version>
+                    <version>2.15.0</version>
                     <configuration>
                         <generateBackupPoms>false</generateBackupPoms>
                     </configuration>