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

sonic-net#16780)

#### Why I did it
src/linkmgrd
```
* f34cb09 - (HEAD -> master, origin/master, origin/HEAD) [warmboot] config all interfaces back to `auto` if reconciliation times out  (sonic-net#220) (8 hours ago) [Jing Zhang]
```
#### How I did it
#### How to verify it
#### Description for the changelog