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

#17476)

#### Why I did it
src/linkmgrd
```
* 79c3872 - (HEAD -> master, origin/master, origin/HEAD) [active-standby] Fix `show mux status` inconsistency introduced by orchagent rollback  (#225) (24 hours ago) [Jing Zhang]
* ba913c0 - [warmboot] use config_db connector to update mux mode config instead of CLI (#223) (2 days ago) [Jing Zhang]
```
#### How I did it
#### How to verify it
#### Description for the changelog