Your requirements could not be resolved to an installable set of packages. Problem 1 - acquia/drupal-spec-tool dev-support/5 requires drupal/core ^9.0 -> found drupal/core[9.0.0-alpha1, ..., 9.5.x-dev] but it conflicts with your root composer.json require (11.x-dev). - acquia/drupal-spec-tool 5.x-dev is an alias of acquia/drupal-spec-tool dev-support/5 and thus requires it to be installed too. - Root composer.json requires acquia/drupal-spec-tool 5.x-dev -> satisfiable by acquia/drupal-spec-tool[5.x-dev (alias of dev-support/5)].

The following actions uses node12 which is deprecated and will be forced to run on node16: actions/checkout@v2, actions/setup-node@v2. For more info: https://github.blog/changelog/2023-06-13-github-actions-all-actions-will-run-on-node16-instead-of-node12-by-default/