Use github actions for release and pypi publishing

This PR:

Bumps protoc to 3.20 (this highest before 4.x which will require regenerating pb files and testing across future releases of synse server)
Uses the public ghr package rather than https://github.com/vapor-ware/synse-server-grpc/blob/master/.jenkins#L49
Bumps CI from python 3.6 to 3.10
Removes deprecated isort flags (https://pycqa.github.io/isort/docs/upgrade_guides/5.0.0.html)

vapor-ware / synse-server-grpc