[submodule] Update submodule sonic-snmpagent to the latest HEAD automatically (#17274)

#### Why I did it
src/sonic-snmpagent
```
* 3b6a4ad - (HEAD -> master, origin/master, origin/HEAD) Enable faulthandler to provide more fault information (#301) (22 hours ago) [Hua Liu]
```
#### How I did it
#### How to verify it
#### Description for the changelog
This commit is contained in:
mssonicbld 2023-11-23 18:35:45 +08:00 committed by GitHub
parent 6d8d42d075
commit c568ecddf9
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@ -1 +1 @@
Subproject commit 347a6e4522111111e13ee1ab4fd4e0a58adcf612 Subproject commit 3b6a4ad338adc0044331b70fc1e6cd589f152829