[202012][sonic-snmpagent]: Advance submodule (#14111)

#### Why I did it
Update sonic-snmpagent submodule to include below commit:
fba50c6  [202012]: snmp vlan support per RFC1213 and added the missing support for RFC2863 (#279)
This commit is contained in:
SuvarnaMeenakshi 2023-03-07 11:16:19 -08:00 committed by GitHub
parent 2ca6ec484e
commit 481f51f45c
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@ -1 +1 @@
Subproject commit 7147354e08d6ee225b96fdf37d2523dacab2736f
Subproject commit fba50c65b00a5662197d6d37c06308e82356e3ea