Update ruby

Changes:

- https://github.com/docker-library/ruby/commit/d6a1e46: Merge pull request https://github.com/docker-library/ruby/pull/367 from sdwolfz/ruby3.1
- https://github.com/docker-library/ruby/commit/9d85d0a: Add ruby 3.1.0-preview1

library/ruby

@@ -4,6 +4,36 @@ Maintainers: Tianon Gravi <[email protected]> (@tianon),
              Joseph Ferguson <[email protected]> (@yosifkit)
 GitRepo: https://github.com/docker-library/ruby.git
 
+Tags: 3.1.0-preview1-bullseye, 3.1-rc-bullseye, 3.1.0-preview1, 3.1-rc
+Architectures: amd64, arm32v5, arm32v7, arm64v8, i386, mips64le, ppc64le, s390x
+GitCommit: 9d85d0a89d473e30aca7c2eee65695676ac41a31
+Directory: 3.1-rc/bullseye
+
+Tags: 3.1.0-preview1-slim-bullseye, 3.1-rc-slim-bullseye, 3.1.0-preview1-slim, 3.1-rc-slim
+Architectures: amd64, arm32v5, arm32v7, arm64v8, i386, mips64le, ppc64le, s390x
+GitCommit: 9d85d0a89d473e30aca7c2eee65695676ac41a31
+Directory: 3.1-rc/slim-bullseye
+
+Tags: 3.1.0-preview1-buster, 3.1-rc-buster
+Architectures: amd64, arm32v5, arm32v7, arm64v8, i386, mips64le, ppc64le, s390x
+GitCommit: 9d85d0a89d473e30aca7c2eee65695676ac41a31
+Directory: 3.1-rc/buster
+
+Tags: 3.1.0-preview1-slim-buster, 3.1-rc-slim-buster
+Architectures: amd64, arm32v5, arm32v7, arm64v8, i386, mips64le, ppc64le, s390x
+GitCommit: 9d85d0a89d473e30aca7c2eee65695676ac41a31
+Directory: 3.1-rc/slim-buster
+
+Tags: 3.1.0-preview1-alpine3.14, 3.1-rc-alpine3.14, 3.1.0-preview1-alpine, 3.1-rc-alpine
+Architectures: amd64, arm32v6, arm32v7, arm64v8, i386, ppc64le, s390x
+GitCommit: 9d85d0a89d473e30aca7c2eee65695676ac41a31
+Directory: 3.1-rc/alpine3.14
+
+Tags: 3.1.0-preview1-alpine3.13, 3.1-rc-alpine3.13
+Architectures: amd64, arm32v6, arm32v7, arm64v8, i386, ppc64le, s390x
+GitCommit: 9d85d0a89d473e30aca7c2eee65695676ac41a31
+Directory: 3.1-rc/alpine3.13
+
 Tags: 3.0.2-bullseye, 3.0-bullseye, 3-bullseye, bullseye, 3.0.2, 3.0, 3, latest
 Architectures: amd64, arm32v5, arm32v7, arm64v8, i386, mips64le, ppc64le, s390x
 GitCommit: 49168590766ac3eb0ad286154b2e01760b79f4b2