[submodule] Update submodule linkmgrd to the latest HEAD automatically (#18255)

#### Why I did it
src/linkmgrd
```
* 1f5fcfd - (HEAD -> 202311, origin/202311) Exclude DbInterface in PR coverage check (#224) (21 hours ago) [Jing Zhang]
```
#### How I did it
#### How to verify it
#### Description for the changelog
This commit is contained in:
mssonicbld 2024-03-05 19:01:48 +08:00 committed by GitHub
parent e13e38b853
commit 1867d24b38
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@ -1 +1 @@
Subproject commit 70b6d15fad7f40d80597791cbc963a59d68c087f
Subproject commit 1f5fcfd21b112c4765d20691c8c4bf8d2842f0c2