chore: updated image

run.sh

@@ -67,7 +67,9 @@ case "$1" in
     ;;
   gu|gemfile-updater)
     shift
-    docker run -it -v "$(pwd)":/app -v /usr/local/bundle:/usr/local/bundle registry.nexusmods.com/nexus-mods/devops/tools/base-image-gemfile-updater:v2.0.2 "$@"
+    GU_IMAGE=registry.nexusmods.com/nexus-mods/devops/tools/base-image-gemfile-updater:stable
+    docker pull $GU_IMAGE
+    docker run -it -v "$(pwd)":/app -v /usr/local/bundle:/usr/local/bundle $GU_IMAGE "$@"
     ;;
   bu|bundle-update)
     shift