Fix PHP CS Fixer: remove parentheses on anonymous classes

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

tests/EventSubscriber/MessengerFailureSubscriberTest.php

@@ -71,7 +71,7 @@ class MessengerFailureSubscriberTest extends TestCase
 
         $subscriber = new MessengerFailureSubscriber($em, $mailer);
 
-        $message = new class () {
+        $message = new class {
             public function __serialize(): array
             {
                 throw new \RuntimeException('not serializable');