[Fix-16272][Alert Server] Alarm server failed to send alarm (#16275)

dolphinscheduler-alert/dolphinscheduler-alert-server/src/main/java/org/apache/dolphinscheduler/alert/service/AbstractEventSender.java

@@ -122,7 +122,7 @@ public abstract class AbstractEventSender<T> implements EventSender<T> {
 
         AlertInfo alertInfo = AlertInfo.builder()
                 .alertData(alertData)
-                .alertParams(PluginParamsTransfer.getPluginParamsMap(instance.getPluginInstanceParams()))
+                .alertParams(JSONUtils.toMap(instance.getPluginInstanceParams()))
                 .alertPluginInstanceId(instance.getId())
                 .build();
         try {