Update ruby

Changes:

- docker-library/ruby@1e6be83: Merge pull request docker-library/ruby#486 from Earlopain/alpine-3.21
- docker-library/ruby@c792563: https://alpinelinux.org/posts/Alpine-3.21.0-released.html
- docker-library/ruby@275c71d: Merge pull request docker-library/ruby#485 from Earlopain/alpine-isnan-isinf-workaround
- docker-library/ruby@bbd386f: Remove alpine isnan/isinf workaround
- docker-library/ruby@cf905a6: Update README

library/ruby

@@ -24,15 +24,15 @@ Architectures: amd64, arm32v7, arm64v8, i386
 GitCommit: f268d3972ab3d0f8c8f6b546be8f0bb613a9dfd9
 Directory: 3.4-rc/slim-bullseye
 
-Tags: 3.4.0-preview2-alpine3.20, 3.4-rc-alpine3.20, 3.4.0-preview2-alpine, 3.4-rc-alpine
+Tags: 3.4.0-preview2-alpine3.21, 3.4-rc-alpine3.21, 3.4.0-preview2-alpine, 3.4-rc-alpine
 Architectures: amd64, arm32v6, arm32v7, arm64v8, i386, ppc64le, riscv64, s390x
-GitCommit: f268d3972ab3d0f8c8f6b546be8f0bb613a9dfd9
-Directory: 3.4-rc/alpine3.20
+GitCommit: c79256398297d00ad8c393ef2a596767954b6042
+Directory: 3.4-rc/alpine3.21
 
-Tags: 3.4.0-preview2-alpine3.19, 3.4-rc-alpine3.19
-Architectures: amd64, arm32v6, arm32v7, arm64v8, i386, ppc64le, s390x
-GitCommit: f268d3972ab3d0f8c8f6b546be8f0bb613a9dfd9
-Directory: 3.4-rc/alpine3.19
+Tags: 3.4.0-preview2-alpine3.20, 3.4-rc-alpine3.20
+Architectures: amd64, arm32v6, arm32v7, arm64v8, i386, ppc64le, riscv64, s390x
+GitCommit: 275c71d834ca184eff0da9bb02c868b44c573271
+Directory: 3.4-rc/alpine3.20
 
 Tags: 3.3.6-bookworm, 3.3-bookworm, 3-bookworm, bookworm, 3.3.6, 3.3, 3, latest
 Architectures: amd64, arm32v5, arm32v7, arm64v8, i386, mips64le, ppc64le, s390x
@@ -54,15 +54,15 @@ Architectures: amd64, arm32v7, arm64v8, i386
 GitCommit: b511945b11599126f923b73533e7b906bb6e95cc
 Directory: 3.3/slim-bullseye
 
-Tags: 3.3.6-alpine3.20, 3.3-alpine3.20, 3-alpine3.20, alpine3.20, 3.3.6-alpine, 3.3-alpine, 3-alpine, alpine
+Tags: 3.3.6-alpine3.21, 3.3-alpine3.21, 3-alpine3.21, alpine3.21, 3.3.6-alpine, 3.3-alpine, 3-alpine, alpine
 Architectures: amd64, arm32v6, arm32v7, arm64v8, i386, ppc64le, riscv64, s390x
-GitCommit: b511945b11599126f923b73533e7b906bb6e95cc
-Directory: 3.3/alpine3.20
+GitCommit: c79256398297d00ad8c393ef2a596767954b6042
+Directory: 3.3/alpine3.21
 
-Tags: 3.3.6-alpine3.19, 3.3-alpine3.19, 3-alpine3.19, alpine3.19
-Architectures: amd64, arm32v6, arm32v7, arm64v8, i386, ppc64le, s390x
-GitCommit: b511945b11599126f923b73533e7b906bb6e95cc
-Directory: 3.3/alpine3.19
+Tags: 3.3.6-alpine3.20, 3.3-alpine3.20, 3-alpine3.20, alpine3.20
+Architectures: amd64, arm32v6, arm32v7, arm64v8, i386, ppc64le, riscv64, s390x
+GitCommit: 275c71d834ca184eff0da9bb02c868b44c573271
+Directory: 3.3/alpine3.20
 
 Tags: 3.2.6-bookworm, 3.2-bookworm, 3.2.6, 3.2
 Architectures: amd64, arm32v5, arm32v7, arm64v8, i386, mips64le, ppc64le, s390x
@@ -84,15 +84,15 @@ Architectures: amd64, arm32v7, arm64v8, i386
 GitCommit: f268d3972ab3d0f8c8f6b546be8f0bb613a9dfd9
 Directory: 3.2/slim-bullseye
 
-Tags: 3.2.6-alpine3.20, 3.2-alpine3.20, 3.2.6-alpine, 3.2-alpine
+Tags: 3.2.6-alpine3.21, 3.2-alpine3.21, 3.2.6-alpine, 3.2-alpine
 Architectures: amd64, arm32v6, arm32v7, arm64v8, i386, ppc64le, riscv64, s390x
-GitCommit: f268d3972ab3d0f8c8f6b546be8f0bb613a9dfd9
-Directory: 3.2/alpine3.20
+GitCommit: c79256398297d00ad8c393ef2a596767954b6042
+Directory: 3.2/alpine3.21
 
-Tags: 3.2.6-alpine3.19, 3.2-alpine3.19
-Architectures: amd64, arm32v6, arm32v7, arm64v8, i386, ppc64le, s390x
-GitCommit: f268d3972ab3d0f8c8f6b546be8f0bb613a9dfd9
-Directory: 3.2/alpine3.19
+Tags: 3.2.6-alpine3.20, 3.2-alpine3.20
+Architectures: amd64, arm32v6, arm32v7, arm64v8, i386, ppc64le, riscv64, s390x
+GitCommit: 275c71d834ca184eff0da9bb02c868b44c573271
+Directory: 3.2/alpine3.20
 
 Tags: 3.1.6-bookworm, 3.1-bookworm, 3.1.6, 3.1
 Architectures: amd64, arm32v5, arm32v7, arm64v8, i386, mips64le, ppc64le, s390x
@@ -114,12 +114,12 @@ Architectures: amd64, arm32v7, arm64v8, i386
 GitCommit: f69cac9888c7909b402a1bc21a87331429318aae
 Directory: 3.1/slim-bullseye
 
-Tags: 3.1.6-alpine3.20, 3.1-alpine3.20, 3.1.6-alpine, 3.1-alpine
+Tags: 3.1.6-alpine3.21, 3.1-alpine3.21, 3.1.6-alpine, 3.1-alpine
 Architectures: amd64, arm32v6, arm32v7, arm64v8, i386, ppc64le, riscv64, s390x
-GitCommit: f69cac9888c7909b402a1bc21a87331429318aae
-Directory: 3.1/alpine3.20
+GitCommit: c79256398297d00ad8c393ef2a596767954b6042
+Directory: 3.1/alpine3.21
 
-Tags: 3.1.6-alpine3.19, 3.1-alpine3.19
-Architectures: amd64, arm32v6, arm32v7, arm64v8, i386, ppc64le, s390x
-GitCommit: f69cac9888c7909b402a1bc21a87331429318aae
-Directory: 3.1/alpine3.19
+Tags: 3.1.6-alpine3.20, 3.1-alpine3.20
+Architectures: amd64, arm32v6, arm32v7, arm64v8, i386, ppc64le, riscv64, s390x
+GitCommit: bbd386f9c78b59db5ba41a01cdbb8decd740c231
+Directory: 3.1/alpine3.20