Bump gradle-versions-plugin from 0.13.0 to 0.21.0
Bump gradle-versions-plugin from 0.13.0 to 0.21.0

Bumps [gradle-versions-plugin](https://github.com/ben-manes/gradle-versions-plugin) from 0.13.0 to 0.21.0.
- [Release notes](https://github.com/ben-manes/gradle-versions-plugin/releases)
- [Commits](https://github.com/ben-manes/gradle-versions-plugin/compare/v0.13.0...v0.21.0)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
openregister/openregister-java,openregister/openregister-java,openregister/openregister-java,openregister/openregister-java,openregister/openregister-java