Bump versions-maven-plugin from 2.7 to 2.8.1
Bump versions-maven-plugin from 2.7 to 2.8.1

Bumps [versions-maven-plugin](https://github.com/mojohaus/versions-maven-plugin) from 2.7 to 2.8.1.
- [Release notes](https://github.com/mojohaus/versions-maven-plugin/releases)
- [Changelog](https://github.com/mojohaus/versions-maven-plugin/blob/master/ReleaseNotes.md)
- [Commits](https://github.com/mojohaus/versions-maven-plugin/compare/versions-maven-plugin-2.7...versions-maven-plugin-2.8.1)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
jenkinsci/priority-sorter-plugin,jenkinsci/priority-sorter-plugin,jenkinsci/priority-sorter-plugin