[submodule] Update submodule sonic-snmpagent to the latest HEAD automatically (#16439)

#### Why I did it
src/sonic-snmpagent
```
* b292c01 - (HEAD -> 202012, origin/202012) Fix FdbUpdater crash when SAI_FDB_ENTRY_ATTR_BRIDGE_PORT_ID attribute missing. (#286) (12 days ago) [Hua Liu]
```
This commit is contained in:
mssonicbld 2023-09-17 03:37:11 +08:00 committed by GitHub
parent f9d83c6e17
commit 9f06c8d2d3
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@ -1 +1 @@
Subproject commit 551898e783789d8c68e59a4128deec16f550e303
Subproject commit b292c01124faae1d7bcdcd45ab5ddce06a43b64a