[submodule] update sonic-snmpagent (#7123)

Includes commits: ``` 8f1526f 2021-03-22 | Temporarily lower the logging level for invalid FDB, which is a known issue on Mellanox (#206) [Qi Luo] ```
sonic-net · Mar 23, 2021 · f609c6a · f609c6a
1 parent 88de361
commit f609c6a
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/src/sonic-snmpagent b/src/sonic-snmpagent