MC-19013: Scheduled update is not created by the admin from not default site

- added strict type

Author: Oleksandr Dubovyk

app/code/Magento/Catalog/Model/Product/Hydrator.php

@@ -3,6 +3,8 @@
  * Copyright © Magento, Inc. All rights reserved.
  * See COPYING.txt for license details.
  */
+declare(strict_types=1);
+
 namespace Magento\Catalog\Model\Product;
 
 use Magento\Framework\EntityManager\HydratorInterface;