Update Alpine to version 3.20 (#4583)

- needed to add double quotes, otherwise it was parsed as 3.2 instead of 3.20

docker/DockerSettings.yaml

@@ -6,7 +6,7 @@ vault_image_digest: "sha256:784838b15c775c81b29e8979aaac36dc5ef44ea18ff0adb7fc56
 xx_image_digest: "sha256:0cd3f05c72d6c9b038eb135f91376ee1169ef3a330d34e418e65e2a5c2e9c0d4"
 rust_version: 1.78.0 # Rust version to be used
 debian_version: bookworm # Debian release name to be used
-alpine_version: 3.19 # Alpine version to be used
+alpine_version: "3.20" # 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

@@ -127,7 +127,7 @@ 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=$TARGETPLATFORM docker.io/library/alpine:3.19
+FROM --platform=$TARGETPLATFORM docker.io/library/alpine:3.20
 
 ENV ROCKET_PROFILE="release" \
     ROCKET_ADDRESS=0.0.0.0 \