feat: 工单提交，审核人字段填充

yanxuan-qc-change-system-biz/src/main/java/com/netease/mail/yanxuan/change/biz/biz/ChangeFlowBiz.java

@@ -557,7 +557,7 @@ public class ChangeFlowBiz {
         changeRecord.setSonChangeClassId(changeFlowCreateReq.getSonChangeClassId());
         changeRecord.setChangeLevel(changeFlowCreateReq.getChangeLevel());
         changeRecord.setChangeCommander(changeCommander);
-        changeRecord.setApprover(changeCommander);
+        changeRecord.setApprover(JSON.toJSONString(Collections.singletonList(changeCommander)));
         changeRecord.setChangeDepartment(changeFlowCreateReq.getChangeDepartment());
         List<ChangeExecConfigReq> changeExecProject = changeFlowCreateReq.getChangeExecProject();
         List<String> execDepartmentList = changeExecProject.stream().map(ChangeExecConfigReq::getChangeExecDepartment)