Fix style issue

Author: Sephster

tests/AuthorizationServerTest.php

@@ -183,7 +183,7 @@ public function testMultipleRequestsGetDifferentResponseTypeInstances(): void
         $privateKey = 'file://' . __DIR__ . '/Stubs/private.key';
         $encryptionKey = 'file://' . __DIR__ . '/Stubs/public.key';
 
-        $responseTypePrototype = new class extends BearerTokenResponse {
+        $responseTypePrototype = new class () extends BearerTokenResponse {
             protected CryptKeyInterface $privateKey;
             protected Key|string|null $encryptionKey = null;