A global notice banner was recently added to the theme component so when the component is up to date it will show the banner and a link to this topic to site admins.
Since we moved the upcoming change to stable last week that banner should now appear for any site that was using the theme component so they can take any necessary actions.
Just a heads up that it might be worth forking the repo if you really want to keep using giphy as we are planning to archive it in the near future.