issue-38758 codestyle fixes ( strict_types and copyright )

Author: rostislav

dev/tests/integration/testsuite/Magento/Developer/Console/Command/DiInfoCommandTest.php

@@ -1,4 +1,9 @@
 <?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+declare(strict_types=1);
 
 namespace Magento\Developer\Console\Command;