[submodule] Update submodule linkmgrd to the latest HEAD automatically (#21724)

#### Why I did it
src/linkmgrd
```
* 927ee8a - (HEAD -> master, origin/master, origin/HEAD) Fix pipeline to use bookworm (#287) (7 days ago) [Longxiang Lyu]
```
#### How I did it
#### How to verify it
#### Description for the changelog

Author: mssonicbld