Update beaker-docker requirement from ~> 0.7.1 to ~> 0.8.3
Update beaker-docker requirement from ~> 0.7.1 to ~> 0.8.3

Updates the requirements on [beaker-docker](https://github.com/voxpupuli/beaker-docker) to permit the latest version.
- [Release notes](https://github.com/voxpupuli/beaker-docker/releases)
- [Commits](https://github.com/voxpupuli/beaker-docker/compare/0.7.1...0.8.3)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
tohuwabohu/puppet-roundcube,tohuwabohu/puppet-roundcube