[submodule] Update submodule dhcpmon to the latest HEAD automatically (#21341)

#### Why I did it
src/dhcpmon
```
* 53bd497 - (HEAD -> 202311, origin/202311) Merge pull request #25 from yaqiangz/202311_bookworm (11 hours ago) [Ying Xie]
* bdc50ec - Update (2 weeks ago) [yaqiangz]
* 66bff68 - Test (2 weeks ago) [yaqiangz]
```
#### How I did it
#### How to verify it
#### Description for the changelog

Author: mssonicbld