[submodule] Update submodule sonic-gnmi to the latest HEAD automatically (#16282)

#### Why I did it
src/sonic-gnmi
```
* 7a1b7cd - (HEAD -> master, origin/master, origin/HEAD) Improve full path logic (#146) (37 minutes ago) [ganglv]
```
#### How I did it
#### How to verify it
#### Description for the changelog
This commit is contained in:
mssonicbld
2023-08-25 16:32:36 +08:00
committed by GitHub
parent e9abf9e5ee
commit 36b21157d6