[Fix-6809][dolphinscheduler-task-sql] Fix sql task can't send alert (#7089)

dolphinscheduler-task-plugin/dolphinscheduler-task-sql/src/main/java/org/apache/dolphinscheduler/plugin/task/sql/SqlTask.java

@@ -289,6 +289,7 @@ public class SqlTask extends AbstractTaskExecutor {
         taskAlertInfo.setAlertGroupId(groupId);
         taskAlertInfo.setContent(content);
         taskAlertInfo.setTitle(title);
+        setTaskAlertInfo(taskAlertInfo);
     }
 
     /**