Bumps [dockerfile-maven-plugin](https://github.com/spotify/dockerfile-maven) from 1.4.5 to 1.4.12. - [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/v1.4.5...v1.4.12) Signed-off-by: dependabot-preview[bot] <support@dependabot.com>