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

#18432)

#### Why I did it
src/linkmgrd
```
* 27aed40 - (HEAD -> 202311, origin/202311) [active-standby] reset mux probing backoff factor in link flaps (#245) (4 hours ago) [Jing Zhang]
```
#### How I did it
#### How to verify it
#### Description for the changelog