Upgrade Document Preview Extension Service

Pull the mirror of the target version on the host where the document preview extension service is deployed (Offline Package);
```
docker pull registry.cn-hangzhou.aliyuncs.com/mdpublic/mingdaoyun-ldoc:version
```
Modify the version number of the corresponding mirror in the ldoc.yaml;
Restart the service

First, stop the service:
```
docker stack rm ldoc
```
Wait until the docker ps command no longer shows the ldoc container, then proceed to start the service again:
```
docker stack deploy -c ldoc.yaml ldoc
```