bugfix：目录订阅收到更新事件时，sql字段update_time为空导致的报错

lishuyuan

2023-11-02 8bd2f47c9a92ffcf5ae43fae965eaefd4748e263

 src/main/java/com/genersoft/iot/vmp/common/VersionPo.java

@@ -1,6 +1,6 @@
package com.genersoft.iot.vmp.common;

import com.alibaba.fastjson.annotation.JSONField;
import com.alibaba.fastjson2.annotation.JSONField;

public class VersionPo {
    /**