[Submodule update] sonic-snmpagent (#7638)

#### Why I did it
Update sonic-snmpaget submodule to pick up new commits:

> Extend rfc3433.py to support more Physical Entity Sensor MIB entries 28b9dfd3a2 

#### How I did it

update the submodule pointer to including the new commits

#### How to verify it

run community snmp test.
This commit is contained in:
Kebo Liu 2021-05-25 07:22:04 +08:00 committed by GitHub
parent 3ea3a5c8c1
commit 0ccd38e4d9
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@ -1 +1 @@
Subproject commit 4e063e4ade89943f2413a767f24564aecfa2cd1c
Subproject commit 28b9dfd3a294904150b2d33bd3ff35a1a637d28d