[submodule] Update submodule linkmgrd to the latest HEAD automaticall…

…y (#16152)

#### Why I did it
src/linkmgrd
```
* 40113fd - (HEAD -> 202305, origin/202305) [active-standby] Fix extra toggle observed in `config reload` (Azure#216) (2 days ago) [Longxiang Lyu]
* b6d40fc - Add ADO to the PR template (Azure#215) (2 days ago) [Longxiang Lyu]
* fe41ad2 - [active-standby] Write `unhealthy` is default route `N/A` (Azure#214) (2 days ago) [Longxiang Lyu]
* 8ff265c - [link prober] Increase pause/restart probe log verbosity (Azure#213) (2 days ago) [Longxiang Lyu]
```
#### How I did it
#### How to verify it
#### Description for the changelog