fix(tests): add copyright

Author: ViPErCZ

tests/Functional/PullRequests/PullRequest7135Test.php

@@ -1,5 +1,14 @@
 <?php
 
+/*
+ * This file is part of the API Platform project.
+ *
+ * (c) Kévin Dunglas <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
 declare(strict_types=1);
 
 namespace ApiPlatform\Tests\Functional\PullRequests;