Add PHP 8.5 to test matrix

Author: prigaux

.github/workflows/test.yml

@@ -28,6 +28,8 @@ jobs:
             phpunit: '9'
           - php: '8.4'
             phpunit: '9'
+          - php: '8.5'
+            phpunit: '12'
     steps:
       - uses: actions/checkout@v2
       - uses: php-actions/composer@v6