Merge pull request #216 from mglaman/php8-support

Update phpstan-drupal for PHP8 support

Author: mglaman

.github/workflows/php.yml

@@ -24,10 +24,9 @@ jobs:
           - php-version: "7.2"
             drupal: "~8.9"
             experimental: false
-# @todo add when upgrading mglaman/phpstan-drupal.
-#          - php-version: "8.0"
-#            drupal: "^9.0"
-#            experimental: true
+          - php-version: "8.0"
+            drupal: "^9.0"
+            experimental: true
     steps:
       - name: "Checkout"
         uses: "actions/checkout@v2"