Pull requests should be submitted to pantheon-systems/drupal-composer-managed. This is a generated repository.
We have not yet decided when we will default Drupal 9 users to PHP 8.x. Drupal 10 users will be defaulted to PHP 8.1.
Drush 11+ may only be installed via Composer. pantheon.yml only supports Drush versions up to 10. Since this project installs Drush via Composer, having the Drush version listed in pantheon.upstream.yml is unnecessary.
Move the defaults up to supported versions of PHP and Drush.