[submodule] Update submodule sonic-bmp to the latest HEAD automatically (sonic-net#24550)

#### Why I did it
src/sonic-bmp
```
* db23384 - (HEAD -> master, origin/master, origin/HEAD) Merge pull request #24 from yijingyan2/migrate-agent-pool-master (3 days ago) [StormLiangMS]
* b4e1bc5 - Automated agent pool migration (7 days ago) [yijingyan2]
```
#### How I did it
#### How to verify it
#### Description for the changelog

Author: mssonicbld