[submodule] Update submodule sonic-snmpagent to the latest HEAD automatically (#17711)

#### Why I did it
src/sonic-snmpagent
```
* 29481f9 - (HEAD -> master, origin/master, origin/HEAD) Fix SNMP dropping some of the queue counter when create_only_config_db_buffers is set to true (#303) (69 minutes ago) [DavidZagury]
```
#### How I did it
#### How to verify it
#### Description for the changelog
This commit is contained in:
mssonicbld 2024-01-09 18:35:46 +08:00 committed by GitHub
parent 47dfb7cc86
commit b406502a42
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@ -1 +1 @@
Subproject commit 3b6a4ad338adc0044331b70fc1e6cd589f152829
Subproject commit 29481f9c42c53123a88baa8a6e64cf8a4e37041f