[submodule] Update submodule dhcpmon to the latest HEAD automatically (sonic-net#19155)

#### Why I did it
src/dhcpmon
```
* 099e148 - (HEAD -> 202311, origin/202311) Merge pull request #22 from yaqiangz/202311_cherry_pick (2 hours ago) [Ying Xie]
* efff8a9 - Fix revert (#21) (2 hours ago) [kellyyeh]
* 617066f - Revert DHCP Counter (#20) (2 hours ago) [kellyyeh]
```
#### How I did it
#### How to verify it
#### Description for the changelog

Author: mssonicbld