[submodule] Update submodule dhcprelay to the latest HEAD automatically (#15781)

#### Why I did it
src/dhcprelay
```
* 3578eb3 - (HEAD -> 202012, origin/202012) [202012] fix dual-tor relay-reply handing issue (#40) (13 days ago) [jcaiMR]
```
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mssonicbld 2023-08-11 07:06:33 +08:00 committed by GitHub
parent 14f5f127c9
commit e57100f8a8
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