[submodule] Update submodule sonic-snmpagent to the latest HEAD automatically (#17863)

#### Why I did it
src/sonic-snmpagent
```
* 6f59d29 - (HEAD -> 202305, origin/202305) Fix SNMP dropping some of the queue counter when create_only_config_db_buffers is set to true (#303) (#309) (33 minutes ago) [mssonicbld]
```
#### How I did it
#### How to verify it
#### Description for the changelog
This commit is contained in:
mssonicbld 2024-01-20 16:32:45 +08:00 committed by GitHub
parent 208c1705f5
commit 5d30151268
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@ -1 +1 @@
Subproject commit 2efaf2e9529c11155e80e637213066b82223cc70 Subproject commit 6f59d29975794e697ad6d76aabc542f9a449e59c