[submodule] Update submodule sonic-gnmi to the latest HEAD automatically (#18491)

#### Why I did it
src/sonic-gnmi
```
* ad8850d - (HEAD -> master, origin/master, origin/HEAD) Merge pull request Azure#195 from liuh-80/dev/liuh/zmq_dpu_support (2 hours ago) [Hua Liu]
* 9b2dcdb - Improve code coverage (2 days ago) [liuh-80]
* a9e52de - Fix code issue (2 days ago) [liuh-80]
* c2d594e - Handle remove ZMQ client error (2 days ago) [liuh-80]
* 70bb2ac - Merge remote-tracking branch 'origin' into dev/liuh/zmq_dpu_support (2 days ago) [liuh-80]
* 1adbee3 - Remove client when retry connect failed (3 days ago) [liuh-80]
* 359459b - Update mixed_db_client.go (7 days ago) [Hua Liu]
* 70352fa - Get DPU address by connecter (7 days ago) [liuh-80]
* 254a29d - Fix UT (8 days ago) [liuh-80]
* c1186ce - Merge with latest code (8 days ago) [liuh-80]
* e4c0649 - Fix space/tab issue (8 days ago) [liuh-80]
* e7fc8fc - Merge remote-tracking branch 'origin' into dev/liuh/get_dpu_address (9 days ago) [liuh-80]
* 0993451 - Add DbSubscriber (9 days ago) [liuh-80]
* ea5f91d - Improve code to use ConfigDBConnector (2 weeks ago) [liuh-80]
* b978e4d - Merge branch 'master' into dev/liuh/get_dpu_address (2 weeks ago) [Qi Luo]
* 654934f - Fix UT (3 weeks ago) [liuh-80]
* cb3d12f - Fix UT (3 weeks ago) [liuh-80]
* 1e2132b - Improve code coverage and fix PR comments (3 weeks ago) [liuh-80]
* a34d2b5 - Fix code (4 weeks ago) [liuh-80]
* 32ab774 - Fix build issue (4 weeks ago) [liuh-80]
* 6862050 - Add getZmqAddress method (4 weeks ago) [liuh-80]
* 17d7c4a - Fix PR comments (4 weeks ago) [liuh-80]
* 39ae8fe - Fix PR comments (4 weeks ago) [liuh-80]
* 628ce20 - Improve code (4 weeks ago) [liuh-80]
* 5f63e1c - Add getDpuAddress method to supprot multiple DPU (4 weeks ago) [liuh-80]
* 44a8071 - (origin/dev/liuh/get_dpu_address) Add getDpuAddress method (4 weeks ago) [liuh-80]
```
#### How I did it
#### How to verify it
#### Description for the changelog

Author: mssonicbld