Issue #3595241: Add Drupal 12 compatibility

Boris Doesborgrequested to merge
issue/ahrefs-3595241:3595241-automated-drupal-12 into 1.1.x
  • Set core_version_requirement to ^11.3 || ^12 in ahrefs.info.yml and drop the stale '# version: VERSION' placeholder.
  • Add composer.json declaring drupal/core ^11.3 || ^12.
  • Import Drupal\Core\Access\AccessResult in AhrefsSettingsForm so ::access() actually resolves the class (regression caught by phpstan level 5).

Closes #3595241

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