chore: Update Rust Alpine versions

[Muscraft]

This updates Rust to support Alpine 3.21 and drops support for Alpine 3.19

[github-actions]

Diff for 6daf75f:

diff --git a/_bashbrew-cat b/_bashbrew-cat
index 0cb0b7f..57a38d8 100644
--- a/_bashbrew-cat
+++ b/_bashbrew-cat
@@ -1,15 +1,15 @@
 Maintainers: Steven Fackler <[email protected]> (@sfackler), Scott Schafer <[email protected]> (@Muscraft)
 GitRepo: https://github.com/rust-lang/docker-rust.git
 
-Tags: 1-alpine3.19, 1.83-alpine3.19, 1.83.0-alpine3.19, alpine3.19
+Tags: 1-alpine3.20, 1.83-alpine3.20, 1.83.0-alpine3.20, alpine3.20
 Architectures: amd64, arm64v8
 GitCommit: 700c4f146427808cfb1e07a646e4afabbe99da4f
-Directory: stable/alpine3.19
+Directory: stable/alpine3.20
 
-Tags: 1-alpine3.20, 1.83-alpine3.20, 1.83.0-alpine3.20, alpine3.20, 1-alpine, 1.83-alpine, 1.83.0-alpine, alpine
+Tags: 1-alpine3.21, 1.83-alpine3.21, 1.83.0-alpine3.21, alpine3.21, 1-alpine, 1.83-alpine, 1.83.0-alpine, alpine
 Architectures: amd64, arm64v8
-GitCommit: 700c4f146427808cfb1e07a646e4afabbe99da4f
-Directory: stable/alpine3.20
+GitCommit: 85c88f3a3e192ad11f392e829c54ded1178e8447
+Directory: stable/alpine3.21
 
 Tags: 1-bookworm, 1.83-bookworm, 1.83.0-bookworm, bookworm, 1, 1.83, 1.83.0, latest
 Architectures: amd64, arm32v7, arm64v8, i386, ppc64le, s390x
diff --git a/_bashbrew-list b/_bashbrew-list
index 4d30d19..77073c5 100644
--- a/_bashbrew-list
+++ b/_bashbrew-list
@@ -1,7 +1,7 @@
 rust:1
 rust:1-alpine
-rust:1-alpine3.19
 rust:1-alpine3.20
+rust:1-alpine3.21
 rust:1-bookworm
 rust:1-bullseye
 rust:1-slim
@@ -9,8 +9,8 @@ rust:1-slim-bookworm
 rust:1-slim-bullseye
 rust:1.83
 rust:1.83-alpine
-rust:1.83-alpine3.19
 rust:1.83-alpine3.20
+rust:1.83-alpine3.21
 rust:1.83-bookworm
 rust:1.83-bullseye
 rust:1.83-slim
@@ -18,16 +18,16 @@ rust:1.83-slim-bookworm
 rust:1.83-slim-bullseye
 rust:1.83.0
 rust:1.83.0-alpine
-rust:1.83.0-alpine3.19
 rust:1.83.0-alpine3.20
+rust:1.83.0-alpine3.21
 rust:1.83.0-bookworm
 rust:1.83.0-bullseye
 rust:1.83.0-slim
 rust:1.83.0-slim-bookworm
 rust:1.83.0-slim-bullseye
 rust:alpine
-rust:alpine3.19
 rust:alpine3.20
+rust:alpine3.21
 rust:bookworm
 rust:bullseye
 rust:latest
diff --git a/_bashbrew-list-build-order b/_bashbrew-list-build-order
index 53fbb59..5137f2b 100644
--- a/_bashbrew-list-build-order
+++ b/_bashbrew-list-build-order
@@ -1,5 +1,5 @@
 rust:alpine
-rust:alpine3.19
+rust:alpine3.20
 rust:bullseye
 rust:latest
 rust:slim
diff --git a/rust_alpine/Dockerfile b/rust_alpine/Dockerfile
index 33203b8..1486f96 100644
--- a/rust_alpine/Dockerfile
+++ b/rust_alpine/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.20
+FROM alpine:3.21
 
 LABEL org.opencontainers.image.source=https://github.com/rust-lang/docker-rust
 
diff --git a/rust_alpine3.19/Dockerfile b/rust_alpine3.19/Dockerfile
deleted file mode 100644
index c601ed6..0000000
diff --git a/rust_alpine/Dockerfile b/rust_alpine3.20/Dockerfile
similarity index 100%
copy from rust_alpine/Dockerfile
copy to rust_alpine3.20/Dockerfile

Relevant Maintainers:

• rust: @sfackler @Muscraft