Release 8.x-2.4 CRITICAL bug fix, this addresses issue [#3127682](https://www.drupal.org/project/rocket_chat/issues/3127682) - `rocket_chat 2.2.0 requires drupal/core 9.1.x-dev` we will no longer depand solely on the Drupal 9.x dev version for dDrupal 8.x. This is done by ensureing that the composer.json definition for drupal/core is either `^8.8` or `^9`. Also mad sure we have a consistant php version defined (and not just the current one in use)