[sonic-snmpagent] Update submodule (#8349)

Includes below commits:
```
43b5e1a 2021-08-04 | CPU Spike because of redundant and flooded keyspace notifis handled (#230) [Vivek Reddy]
4d6bb79 2021-08-02 | Non-block reading counters to tolerate corrupted/delayed counters in COUNTERS_DB (#229) [Qi Luo]
```
This commit is contained in:
Qi Luo 2021-08-05 18:39:36 -07:00 committed by GitHub
parent 702e852ee1
commit 1fd09bb7bc
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@ -1 +1 @@
Subproject commit 21d7d97c6944fcd1df116bb8f60561e7d1e15608
Subproject commit 43b5e1abefb7a1690e21d07eaa97479478bd5454