MC-33909: Fix Integration tests php 7.4

Author: xmav

app/code/Magento/Sales/Controller/Adminhtml/Order/Creditmemo/Save.php

@@ -104,7 +104,8 @@ public function execute()
                     \Magento\Sales\Api\CreditmemoManagementInterface::class
                 );
                 $creditmemo->getOrder()->setCustomerNoteNotify(!empty($data['send_email']));
-                $creditmemoManagement->refund($creditmemo, (bool)$data['do_offline']);
+                $doOffline = isset($data['do_offline']) ? (bool)$data['do_offline'] : false;
+                $creditmemoManagement->refund($creditmemo, $doOffline);
 
                 if (!empty($data['send_email'])) {
                     $this->creditmemoSender->send($creditmemo);

dev/tests/integration/testsuite/Magento/Framework/Backup/_files/var/backups/1474538269_filesystem_code.tgz

@@ -85,8 +85,8 @@ protected function _initWriter()
      */
     protected static function _getFormatParseHeader()
     {
-        return 'a100name/a8mode/a8uid/a8gid/a12size/a12mtime/a8checksum/a1type/a100symlink/a6magic/a2version/' .
-            'a32uname/a32gname/a8devmajor/a8devminor/a155prefix/a12closer';
+        return 'Z100name/Z8mode/Z8uid/Z8gid/Z12size/Z12mtime/Z8checksum/Z1type/Z100symlink/Z6magic/Z2version/' .
+            'Z32uname/Z32gname/Z8devmajor/Z8devminor/Z155prefix/Z12closer';
     }
 
     /**