[sonic-snmpagent] Update submodule (#16563)

#### Why I did it
Including below commits:
```
2c6ed2e 2023-09-14 | Support interface speed for PortChannels (#262) [Lukas Stockner]
```

##### Work item tracking
- Microsoft ADO **(number only)**: 25085425
This commit is contained in:
Qi Luo 2023-09-15 22:20:49 -07:00 committed by GitHub
parent 7d66e517b8
commit 93af5dd052
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23

Diff Content Not Available