Update Alpine to version 3.21 (#5256)

docker/DockerSettings.yaml

@@ -7,7 +7,7 @@ vault_image_digest: "sha256:409ab328ca931439cb916b388a4bb784bd44220717aaf74cf716
 xx_image_digest: "sha256:1978e7a58a1777cb0ef0dde76bad60b7914b21da57cfa88047875e4f364297aa"
 rust_version: 1.83.0 # Rust version to be used
 debian_version: bookworm # Debian release name to be used
-alpine_version: "3.20" # Alpine version to be used
+alpine_version: "3.21" # Alpine version to be used
 # For which platforms/architectures will we try to build images
 platforms: ["linux/amd64", "linux/arm64", "linux/arm/v7", "linux/arm/v6"]
 # Determine the build images per OS/Arch

docker/Dockerfile.alpine

@@ -126,7 +126,7 @@ RUN source /env-cargo && \
 # To uninstall: docker run --privileged --rm tonistiigi/binfmt --uninstall 'qemu-*'
 #
 # We need to add `--platform` here, because of a podman bug: https://github.com/containers/buildah/issues/4742
-FROM --platform=$TARGETPLATFORM docker.io/library/alpine:3.20
+FROM --platform=$TARGETPLATFORM docker.io/library/alpine:3.21
 
 ENV ROCKET_PROFILE="release" \
     ROCKET_ADDRESS=0.0.0.0 \