[submodule] Update submodule dhcpmon to the latest HEAD automatically (#16550)

#### Why I did it
src/dhcpmon
```
* 7c55e50 - (HEAD -> master, origin/master, origin/HEAD) Merge pull request #13 from jcaiMR/dev/jcai_master_interface_counter (7 days ago) [StormLiangMS]
* 085a087 - refine counting logic (10 days ago) [jcaiMR]
* de96a98 - Merge branch 'master' into dev/jcai_master_interface_counter (11 days ago) [jcaiMR]
* 5cb4468 - dhcp per-interface counter init commit (12 days ago) [jcaiMR]
```
#### How I did it
#### How to verify it
#### Description for the changelog
This commit is contained in:
mssonicbld 2023-09-21 16:33:33 +08:00 committed by GitHub
parent 53d8a9b5b2
commit cc6a9b6832
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23

@ -1 +1 @@
Subproject commit a3c5381307ec4f7fbcc2ac8626caf3b32d997127
Subproject commit 7c55e502a1b054aa01c056dc1018e4b863975445