fix response `content-type` is not set if access without access token

Kairlec

2023-05-15 ca103731c721aae3f5f622e58c679ed5c09fd9e9

 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 {
    /**