[sonic-snmpagent] Update submodule (#13806)

#### Why I did it Include below commits: ``` 4622b8d 2023-02-14 | Fix: zero route may have empty nexthop (#276) [Qi Luo] ```
sonic-net · Feb 15, 2023 · 373f091 · 373f091
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commit 373f091
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/src/sonic-snmpagent b/src/sonic-snmpagent