Try using environment variable for protoc run

[brentru]

Trying to use PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION for protoc deployment to avoid errors like on https://github.com/adafruit/Wippersnapper_Protobuf/runs/7906603895?check_suite_focus=true

 2. Set PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION=python (but this will use pure-Python parsing and will be much slower).