New syft-proto workflow in CONTRIBUTING.md (#2842)
New syft-proto workflow in CONTRIBUTING.md (#2842)

Suggested new workflow for syft-proto updates.
This is required after the recent change in requirements.txt where syft-proto package is not referenced as direct git url anymore.
Please also see corresponding PR in syft-proto: https://github.com/OpenMined/syft-proto/pull/16
OpenMined/PySyft,OpenMined/PySyft,OpenMined/PySyft,OpenMined/PySyft