[submodule] Update submodule sonic-gnmi to the latest HEAD automatica…

…lly (#21699)

#### Why I did it
src/sonic-gnmi
```
* 1425d56 - (HEAD -> master, origin/master, origin/HEAD) Update incremental config to support multi-asic (#355) (64 minutes ago) [ganglv]
* 22f767f - Merge pull request #341 from SuvarnaMeenakshi/fabric_masic (6 hours ago) [SuvarnaMeenakshi]
* d3261f6 - Fix as per review comment (3 days ago) [Suvarna Meenakshi]
* d7b74a5 - Modify to use environment variable to specify unit test env (6 days ago) [Suvarna Meenakshi]
* 812b1d0 - Use global variable UnitTest as a flag to reinit fabric counters if invoked during unit testing (6 days ago) [Suvarna Meenakshi]
* c4fe5c4 - Merge remote-tracking branch 'origin/master' into HEAD (11 days ago) [Suvarna Meenakshi]
* bad1f4a - Remove clean up added for debug (11 days ago) [Suvarna Meenakshi]
* 5d7586d - Fix incorrect char and space (11 days ago) [Suvarna Meenakshi]
* 697005d - Fix white space (11 days ago) [Suvarna Meenakshi]
* c2fae6d - Revert "Fix whitespace" (11 days ago) [Suvarna Meenakshi]
* 29ffb43 - Fix whitespace (11 days ago) [Suvarna Meenakshi]
* 8440cdb - Fix comment (11 days ago) [Suvarna Meenakshi]
* e12240c - Add comment (11 days ago) [Suvarna Meenakshi]
* 5820035 - Update to reset countersFabricPortNameMap (11 days ago) [Suvarna Meenakshi]
* 4c38c8d - Remove empty line (11 days ago) [Suvarna Meenakshi]
* c3fa03d - Remove debug prints (11 days ago) [Suvarna Meenakshi]
* 583707b - Fix white space add comment as per review comment (12 days ago) [Suvarna Meenakshi]
* 4555836 - Fix whitespace (12 days ago) [Suvarna Meenakshi]
* 728c3d9 - Add unit test (12 days ago) [Suvarna Meenakshi]
* 3246434 - Revert "Add unit-test" (12 days ago) [Suvarna Meenakshi]
* e90e6cd - Add unit-test (12 days ago) [Suvarna Meenakshi]
* 65187b8 - Modify to work for single asic linecard (3 weeks ago) [Suvarna Meenakshi]
* 76314e3 - Merge remote-tracking branch 'origin/master' into fabric_masic (3 weeks ago) [Suvarna Meenakshi]
* 316a491 - Modify Fabric port name to append asic namespace to form unique port name within a linecard module (3 weeks ago) [Suvarna Meenakshi]
* 8ff0269 - Add multi-asic support for Fabric port counters (4 weeks ago) [Suvarna Meenakshi]
```
#### How I did it
#### How to verify it
#### Description for the changelog