Update docker/distribution to 2.6.1
Update docker/distribution to 2.6.1 - https://github.com/docker/distribution/releases
- Fixes gitlab-ce#23087
- https://gitlab.com/gitlab-org/omnibus-gitlab/merge_requests/1018
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Update docker/distribution to 2.6.1 - https://github.com/docker/distribution/releases