Merge pull request #10304 from taslangraham/i10303-main

add missing Notification class import

classes/submission/DAO.php

@@ -26,6 +26,7 @@
 use PKP\db\DAORegistry;
 use PKP\log\event\EventLogEntry;
 use PKP\note\Note;
+use PKP\notification\Notification;
 use PKP\query\QueryDAO;
 use PKP\services\PKPSchemaService;
 use PKP\stageAssignment\StageAssignment;