Upgrade to Docker Distribution 2.6.1 broke AWS S3 uploads

After deploying 9.2RC3, users complained that pushes to the registry stopped working:

• https://gitlab.com/gitlab-org/gitlab-ce/issues/32458
• https://gitlab.com/gitlab-org/gitlab-ce/issues/32457

The registry logs show:

s3aws: NotImplemented: A header you provided implies functionality that is not implemented\n\tstatus code: 501

Once we reverted the /opt/gitlab/embedded/bin/registry binary from 2.6.1 to 2.4.1, things worked:

Other references: https://github.com/openshift/docker-distribution/blob/master/docs/storage-drivers/s3.md

/cc: @ayufan, @northrup, @rspeicher