[submodule] Update submodule linkmgrd to the latest HEAD automatically (#18372)

#### Why I did it
src/linkmgrd
```
* dd61844 - (HEAD -> master, origin/master, origin/HEAD) [active-standby] reset mux probing backoff factor in link flaps (#245) (5 hours ago) [Jing Zhang]
```
#### How I did it
#### How to verify it
#### Description for the changelog
This commit is contained in:
mssonicbld 2024-03-15 19:01:16 +08:00 committed by GitHub
parent a33330941c
commit a0ba655b34
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@ -1 +1 @@
Subproject commit 74c33eacf4325b6e0f3e3b11fc6c50b4222921a1 Subproject commit dd618447e2cc1838431d94f1f8bffa807ef65d89