Update ruby

Changes:

- https://github.com/docker-library/ruby/commit/4e09dcf: Update 3.4-rc to 3.4.0-preview2
- https://github.com/docker-library/ruby/commit/2895a67: Update `generate-stackbrew-library.sh` to support `BASHBREW_LIBRARY` for easier cascading updates

library/ruby

@@ -4,34 +4,34 @@ Maintainers: Tianon Gravi <[email protected]> (@tianon),
              Joseph Ferguson <[email protected]> (@yosifkit)
 GitRepo: https://github.com/docker-library/ruby.git
 
-Tags: 3.4.0-preview1-bookworm, 3.4-rc-bookworm, 3.4.0-preview1, 3.4-rc
+Tags: 3.4.0-preview2-bookworm, 3.4-rc-bookworm, 3.4.0-preview2, 3.4-rc
 Architectures: amd64, arm32v5, arm32v7, arm64v8, i386, mips64le, ppc64le, s390x
-GitCommit: f69cac9888c7909b402a1bc21a87331429318aae
+GitCommit: 4e09dcf80f32040cde8ff4bb226367d45beadcd8
 Directory: 3.4-rc/bookworm
 
-Tags: 3.4.0-preview1-slim-bookworm, 3.4-rc-slim-bookworm, 3.4.0-preview1-slim, 3.4-rc-slim
+Tags: 3.4.0-preview2-slim-bookworm, 3.4-rc-slim-bookworm, 3.4.0-preview2-slim, 3.4-rc-slim
 Architectures: amd64, arm32v5, arm32v7, arm64v8, i386, mips64le, ppc64le, s390x
-GitCommit: f69cac9888c7909b402a1bc21a87331429318aae
+GitCommit: 4e09dcf80f32040cde8ff4bb226367d45beadcd8
 Directory: 3.4-rc/slim-bookworm
 
-Tags: 3.4.0-preview1-bullseye, 3.4-rc-bullseye
+Tags: 3.4.0-preview2-bullseye, 3.4-rc-bullseye
 Architectures: amd64, arm32v7, arm64v8, i386
-GitCommit: f69cac9888c7909b402a1bc21a87331429318aae
+GitCommit: 4e09dcf80f32040cde8ff4bb226367d45beadcd8
 Directory: 3.4-rc/bullseye
 
-Tags: 3.4.0-preview1-slim-bullseye, 3.4-rc-slim-bullseye
+Tags: 3.4.0-preview2-slim-bullseye, 3.4-rc-slim-bullseye
 Architectures: amd64, arm32v7, arm64v8, i386
-GitCommit: f69cac9888c7909b402a1bc21a87331429318aae
+GitCommit: 4e09dcf80f32040cde8ff4bb226367d45beadcd8
 Directory: 3.4-rc/slim-bullseye
 
-Tags: 3.4.0-preview1-alpine3.20, 3.4-rc-alpine3.20, 3.4.0-preview1-alpine, 3.4-rc-alpine
+Tags: 3.4.0-preview2-alpine3.20, 3.4-rc-alpine3.20, 3.4.0-preview2-alpine, 3.4-rc-alpine
 Architectures: amd64, arm32v6, arm32v7, arm64v8, i386, ppc64le, riscv64, s390x
-GitCommit: f69cac9888c7909b402a1bc21a87331429318aae
+GitCommit: 4e09dcf80f32040cde8ff4bb226367d45beadcd8
 Directory: 3.4-rc/alpine3.20
 
-Tags: 3.4.0-preview1-alpine3.19, 3.4-rc-alpine3.19
+Tags: 3.4.0-preview2-alpine3.19, 3.4-rc-alpine3.19
 Architectures: amd64, arm32v6, arm32v7, arm64v8, i386, ppc64le, s390x
-GitCommit: f69cac9888c7909b402a1bc21a87331429318aae
+GitCommit: 4e09dcf80f32040cde8ff4bb226367d45beadcd8
 Directory: 3.4-rc/alpine3.19
 
 Tags: 3.3.5-bookworm, 3.3-bookworm, 3-bookworm, bookworm, 3.3.5, 3.3, 3, latest