Bump dockerfile-maven-plugin from 1.4.8 to 1.4.9
Bump dockerfile-maven-plugin from 1.4.8 to 1.4.9

Bumps [dockerfile-maven-plugin](https://github.com/spotify/dockerfile-maven) from 1.4.8 to 1.4.9.
- [Release notes](https://github.com/spotify/dockerfile-maven/releases)
- [Changelog](https://github.com/spotify/dockerfile-maven/blob/master/CHANGELOG.md)
- [Commits](https://github.com/spotify/dockerfile-maven/compare/v1.4.8...v1.4.9)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
stefanneuhaus/DependencyCheck,jeremylong/DependencyCheck,jeremylong/DependencyCheck,stefanneuhaus/DependencyCheck,stefanneuhaus/DependencyCheck,jeremylong/DependencyCheck,stefanneuhaus/DependencyCheck,stefanneuhaus/DependencyCheck,jeremylong/DependencyCheck,stefanneuhaus/DependencyCheck,stefanneuhaus/DependencyCheck,jeremylong/DependencyCheck,jeremylong/DependencyCheck,jeremylong/DependencyCheck,stefanneuhaus/DependencyCheck,jeremylong/DependencyCheck