[submodule] Update submodule dhcpmon to the latest HEAD automatically (#18273)

#### Why I did it
src/dhcpmon
```
* 22a7467 - (HEAD -> master, origin/master, origin/HEAD) Fix revert (#21) (9 hours ago) [kellyyeh]
* b1d890a - Revert DHCP Counter (#20) (24 hours ago) [kellyyeh]
```
#### How I did it
#### How to verify it
#### Description for the changelog
This commit is contained in:
mssonicbld 2024-03-07 19:01:17 +08:00 committed by GitHub
parent ab7153abad
commit 5db634beb1
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GPG Key ID: B5690EEEBB952194

@ -1 +1 @@
Subproject commit fc20a97ba2eba753974ea95d504d130093030596
Subproject commit 22a7467a8ab3e26c3d20e959a0702380f0d4b5ae