Changes:

- Support Git HTTP on toplevel repositories
  https://gitlab.com/gitlab-org/gitlab-workhorse/-/merge_requests/670
- Update GoCloud to v0.21.1+
  https://gitlab.com/gitlab-org/gitlab-workhorse/-/merge_requests/675
- Allow blank S3 regions to be used
  https://gitlab.com/gitlab-org/gitlab-workhorse/-/merge_requests/677