[submodule] Update snmpagent (#9102)

Why I did it
Update pointer to this commit in sonic-snmpagent:

a07da53 2021-10-26 Removed unused variables in rfc2863.py (#237)
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Raphael Tryster 2021-11-08 19:55:24 +02:00 committed by GitHub
parent a2d0dbe604
commit e8d316de61
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@ -1 +1 @@
Subproject commit c2d494504d35c0efa2629d83ad582f18ea4c809f
Subproject commit a07da536186a9d9698ec63ec3b1e75bef097ae00