MAGETWO-93188: Product date attribute: An error displays for default date greater than 12 with local using dd/mm/yyyy

- Fixed static test strict type missing

Author: Oleksandr Dubovyk

dev/tests/integration/testsuite/Magento/Eav/Model/Entity/AttributeTest.php

@@ -3,6 +3,9 @@
  * Copyright © Magento, Inc. All rights reserved.
  * See COPYING.txt for license details.
  */
+
+declare(strict_types=1);
+
 namespace Magento\Eav\Model\Entity;
 
 use Magento\TestFramework\Helper\Bootstrap;