[submodule] Update submodule linkmgrd to the latest HEAD automatically (#18016)

#### Why I did it
src/linkmgrd
```
* 70b6d15 - (HEAD -> 202311, origin/202311) [active-standby] Fix `show mux status` inconsistency introduced by orchagent rollback  (#225) (3 days ago) [Jing Zhang]
```
#### How I did it
#### How to verify it
#### Description for the changelog
This commit is contained in:
mssonicbld 2024-02-05 16:33:00 +08:00 committed by GitHub
parent 0155096300
commit 627d9cb3bb
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@ -1 +1 @@
Subproject commit 74e455e01779e7da240c50d97d40de550fc2aa72
Subproject commit 70b6d15fad7f40d80597791cbc963a59d68c087f