ISTWCMS-6746: Update Drush to version 11.
Drush version 11 is the one to support Drupal 9 and Drupal 10. This is temporary, once we move to Drupal 10, we will need to upgrade to Drush 12.
On or around 9:00am on Monday the 9th of March, git.uwaterloo.ca will be restarted to apply security and application patches. This maintenance should bring GitLab to latest patch in 18.9.x release line.
Drush version 11 is the one to support Drupal 9 and Drupal 10. This is temporary, once we move to Drupal 10, we will need to upgrade to Drush 12.