[submodule] Update submodule linkmgrd to the latest HEAD automatically (

#17731)

#### Why I did it
src/linkmgrd
```
* 2f5971f - (HEAD -> 202305, origin/202305) [warmboot] use config_db connector to update mux mode config instead of CLI (#223) (4 hours ago) [Jing Zhang]
```
#### How I did it
#### How to verify it
#### Description for the changelog