Workaround to replace pip on Windows
Workaround to replace pip on Windows

- `.env/Scripts/pip install -r requirements.txt` fails on Windows if requirements contains pip. This happens because file being executed becomes locked and it's impossible to change it's content (access denied). To prevent this issue adding the following workaround: Copy original `pip.exe` and using this copy to update `pip.exe`

alexsaveliev/srclib-python,alexsaveliev/srclib-python,alexsaveliev/srclib-python,sourcegraph/srclib-python