fix(docker): aligning all rockylinux-9 Dockerfiles with the RHEL9 ones

Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>

cmake_targets/tools/build_helper

@@ -137,6 +137,7 @@ check_supported_distribution() {
         "rocky9.1")    return 0 ;;
         "rocky9.2")    return 0 ;;
         "rocky9.3")    return 0 ;;
+        "rocky9.4")    return 0 ;;
     esac
     return 1
 }