Registry v3.rc-4 release

See
* https://github.com/distribution/distribution/releases/tag/v3.0.0-rc.4
* distribution/distribution-library-image#185

Signed-off-by: Milos Gajdos <milosthegajdos@gmail.com>

Author: milosgajdos

library/registry

@@ -3,9 +3,9 @@ Maintainers: Milos Gajdos (@milosgajdos),
 GitRepo: https://github.com/distribution/distribution-library-image.git
 GitFetch: refs/heads/master
 
-Tags: 3.0.0-rc.3
+Tags: 3.0.0-rc.4
 Architectures: amd64, arm64v8, arm32v6, arm32v7, ppc64le, s390x, riscv64
-GitCommit: db464de56afaf09f0d702f30f422a3e19e953a53
+GitCommit: 89160e7182642ca47e43f5a3cd2388ccf5663551
 
 Tags: 2.8.3, 2.8, 2, latest
 Architectures: amd64, arm64v8, arm32v6, arm32v7, ppc64le, s390x