[submodule] Update submodule sonic-bmp to the latest HEAD automatical…

…ly (sonic-net#20812)

#### Why I did it
src/sonic-bmp
```
* 8c4311d - (HEAD -> master, origin/master, origin/HEAD) Merge pull request #14 from FengPan-Frank/deb_change (3 hours ago) [Feng-msft]
* 298c07b - Merge branch 'deb_change' of https://github.com/FengPan-Frank/sonic-bmp into deb_change (4 hours ago) [Feng Pan]
|\ 
| failure_prs.log 906765d - test debian (15 hours ago) [Feng Pan]
* 857b751 - test debian (4 hours ago) [Feng Pan]
```
#### How I did it
#### How to verify it
#### Description for the changelog