[submodule] Update submodule sonic-gnmi to the latest HEAD automatically (#18104)

#### Why I did it
src/sonic-gnmi
```
* 50849ce - (HEAD -> 202305, origin/202305) Replace PFC_WD_TABLE with PFC_WD (#173) (22 hours ago) [Zain Budhwani]
```
#### How I did it
#### How to verify it
#### Description for the changelog
This commit is contained in:
mssonicbld 2024-02-16 16:33:03 +08:00 committed by GitHub
parent 3b1d3dfff6
commit 435e586419
No known key found for this signature in database
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@ -1 +1 @@
Subproject commit 7848cfbc5ea995834ba45b46738b543aa63c6a05
Subproject commit 50849ce7b279b916dcb6782b88c9cb2d189c67d0