[submodule] Update submodule sonic-snmpagent to the latest HEAD automatically (#18655)

#### Why I did it
src/sonic-snmpagent
```
* f652948 - (HEAD -> master, origin/master, origin/HEAD) snmp-subagent changes for bookworm upgrade (#313) (2 hours ago) [mohan-selvaraj]
* 204d97d - Update dotnet version installed to 8.0 (#314) (2 hours ago) [Saikrishna Arcot]
```
#### How I did it
#### How to verify it
#### Description for the changelog

Author: mssonicbld