Update ruby

Changes:

- https://github.com/docker-library/ruby/commit/158d90b: Update to 2.7.0-rc1

library/ruby

@@ -4,19 +4,19 @@ Maintainers: Tianon Gravi <[email protected]> (@tianon),
              Joseph Ferguson <[email protected]> (@yosifkit)
 GitRepo: https://github.com/docker-library/ruby.git
 
-Tags: 2.7.0-preview3-buster, 2.7-rc-buster, rc-buster, 2.7.0-preview3, 2.7-rc, rc
+Tags: 2.7.0-rc1-buster, 2.7-rc-buster, rc-buster, 2.7.0-rc1, 2.7-rc, rc
 Architectures: amd64, arm32v5, arm32v7, arm64v8, i386, ppc64le, s390x
-GitCommit: 5e9c75e51671c0ed661b8654618596602a21fae0
+GitCommit: 158d90b04f0dfeac68001c54dde423100d2aad33
 Directory: 2.7-rc/buster
 
-Tags: 2.7.0-preview3-slim-buster, 2.7-rc-slim-buster, rc-slim-buster, 2.7.0-preview3-slim, 2.7-rc-slim, rc-slim
+Tags: 2.7.0-rc1-slim-buster, 2.7-rc-slim-buster, rc-slim-buster, 2.7.0-rc1-slim, 2.7-rc-slim, rc-slim
 Architectures: amd64, arm32v5, arm32v7, arm64v8, i386, ppc64le, s390x
-GitCommit: 5e9c75e51671c0ed661b8654618596602a21fae0
+GitCommit: 158d90b04f0dfeac68001c54dde423100d2aad33
 Directory: 2.7-rc/buster/slim
 
-Tags: 2.7.0-preview3-alpine3.10, 2.7-rc-alpine3.10, rc-alpine3.10, 2.7.0-preview3-alpine, 2.7-rc-alpine, rc-alpine
+Tags: 2.7.0-rc1-alpine3.10, 2.7-rc-alpine3.10, rc-alpine3.10, 2.7.0-rc1-alpine, 2.7-rc-alpine, rc-alpine
 Architectures: amd64, arm32v6, arm32v7, arm64v8, i386, ppc64le, s390x
-GitCommit: 5e9c75e51671c0ed661b8654618596602a21fae0
+GitCommit: 158d90b04f0dfeac68001c54dde423100d2aad33
 Directory: 2.7-rc/alpine3.10
 
 Tags: 2.6.5-buster, 2.6-buster, 2-buster, buster, 2.6.5, 2.6, 2, latest