ci: refactor: Use version id over version codename consistently

Also, remove the minor version from the comment, because it does not
matter and may even change at any time.

Author: MarcoFalke

ci/test/00_setup_env_arm.sh

@@ -10,7 +10,7 @@ export HOST=arm-linux-gnueabihf
 export DPKG_ADD_ARCH="armhf"
 export PACKAGES="python3-zmq g++-arm-linux-gnueabihf busybox libc6:armhf libstdc++6:armhf libfontconfig1:armhf libxcb1:armhf"
 export CONTAINER_NAME=ci_arm_linux
-export CI_IMAGE_NAME_TAG="mirror.gcr.io/ubuntu:noble"  # Check that https://packages.ubuntu.com/noble/g++-arm-linux-gnueabihf (version 13.3, similar to guix) can cross-compile
+export CI_IMAGE_NAME_TAG="mirror.gcr.io/ubuntu:24.04"  # Check that https://packages.ubuntu.com/noble/g++-arm-linux-gnueabihf (version 13.x, similar to guix) can cross-compile
 export CI_IMAGE_PLATFORM="linux/arm64"
 export USE_BUSY_BOX=true
 export RUN_UNIT_TESTS=true

ci/test/00_setup_env_win64.sh

@@ -7,7 +7,7 @@
 export LC_ALL=C.UTF-8
 
 export CONTAINER_NAME=ci_win64
-export CI_IMAGE_NAME_TAG="mirror.gcr.io/ubuntu:noble"  # Check that g++-mingw-w64-x86-64-posix (version 13.2, similar to guix) can cross-compile
+export CI_IMAGE_NAME_TAG="mirror.gcr.io/ubuntu:24.04"  # Check that https://packages.ubuntu.com/noble/g++-mingw-w64-x86-64-posix (version 13.x, similar to guix) can cross-compile
 export CI_IMAGE_PLATFORM="linux/amd64"
 export HOST=x86_64-w64-mingw32
 export PACKAGES="g++-mingw-w64-x86-64-posix nsis"