rtmros_common: 1.0.0-21 in 'groovy/release.yaml' [bloom]

Increasing version of package(s) in repository `rtmros_common`:
- previous version: `1.0.0-20`
- new version: `1.0.0-21`
- distro file: `groovy/release.yaml`
- bloom version: `0.4.4`