[submodule] Update submodule dhcpmon to the latest HEAD automatically (#23835)

#### Why I did it
src/dhcpmon
```
* 1da5c92 - (HEAD -> 202505, origin/202505) Fix fail to clear counter in some low performance devices (#50) (4 days ago) [mssonicbld]
```
#### How I did it
#### How to verify it
#### Description for the changelog

Author: mssonicbld