Add PHP 8.5 to test pipeline

Author: ElGigi

.github/workflows/tests.yml

@@ -11,7 +11,7 @@ jobs:
         continue-on-error: ${{ !matrix.stable }}
         strategy:
             matrix:
-                php-versions: ['8.0', '8.1', '8.2', '8.3', '8.4']
+                php-versions: ['8.0', '8.1', '8.2', '8.3', '8.4', '8.5']
                 stable: [true]
                 coverage: [true]
                 composer-flags: ['']