MAGETWO-94369: [Forwardport] Move cron improvements from 2.2 to 2.3

Author: Bohdan Korablov

dev/tests/integration/testsuite/Magento/Framework/Lock/Backend/DatabaseTest.php

@@ -3,6 +3,7 @@
  * Copyright © Magento, Inc. All rights reserved.
  * See COPYING.txt for license details.
  */
+declare(strict_types=1);
 
 /**
  * \Magento\Framework\Lock\Backend\Database test case

lib/internal/Magento/Framework/Lock/Test/Unit/Backend/DatabaseTest.php

@@ -3,6 +3,8 @@
  * Copyright © Magento, Inc. All rights reserved.
  * See COPYING.txt for license details.
  */
+declare(strict_types=1);
+
 namespace Magento\Framework\Lock\Test\Unit\Backend;
 
 use Magento\Framework\Lock\Backend\Database;