[submodule] Update submodule sonic-gnmi to the latest HEAD automatically (#23691)

#### Why I did it
src/sonic-gnmi
```
* 7ec9e7d - (HEAD -> master, origin/master, origin/HEAD) Add support for `show interface fec status` (#475) (4 hours ago) [Changrong Wu]
* 57083b8 - Merge pull request #469 from yutongzhang-microsoft/yutongzhang/get_xcvr_error (19 hours ago) [Feng-msft]
* 6792dcf - Fix (20 hours ago) [yutongzhang-microsoft]
* b448d66 - Fix (21 hours ago) [yutongzhang-microsoft]
* 072298e - Fix (21 hours ago) [yutongzhang-microsoft]
* a3653dc - Fix (21 hours ago) [yutongzhang-microsoft]
* adca27c - Fix (24 hours ago) [yutongzhang-microsoft]
* 613867f - Fix go format (25 hours ago) [yutongzhang-microsoft]
* 5eb9953 - Merge branch 'master' into yutongzhang/get_xcvr_error (25 hours ago) [Yutong Zhang]
* 0224696 - Fix (25 hours ago) [yutongzhang-microsoft]
* b6b99af - Add an option (2 days ago) [yutongzhang-microsoft]
* ce0fdb1 - Fix (2 days ago) [yutongzhang-microsoft]
* 48c8b18 - Fix (2 days ago) [yutongzhang-microsoft]
* edde476 - Fix (2 days ago) [yutongzhang-microsoft]
* 52139ae - Sync with master (2 days ago) [yutongzhang-microsoft]
* aab8540 - Sync with master (2 days ago) [yutongzhang-microsoft]
* fa9fb04 - Sync with master (2 days ago) [yutongzhang-microsoft]
* 63533a0 - Sync with master (2 days ago) [yutongzhang-microsoft]
* eff9196 - Revert format change (2 days ago) [yutongzhang-microsoft]
```
#### How I did it
#### How to verify it
#### Description for the changelog

Author: mssonicbld