`uvicorn-worker` requires `gunicorn` which is not available on Windows

[mgorny]

The package has an unconditional dependency on uvicorn-worker:

functions-framework-python/pyproject.toml

Line 35 in d13d9aa

"uvicorn-worker>=0.2.0,<1.0.0; python_version>='3.8'",

However, uvicorn-worker depends on gunicorn which isn't available on Windows:

https://github.com/Kludex/uvicorn-worker/blob/cd29cc6447cff3abc968e930023dc97e5e5080f9/pyproject.toml#L26

FWICS the dependency is actually unconditional:

https://github.com/Kludex/uvicorn-worker/blob/cd29cc6447cff3abc968e930023dc97e5e5080f9/uvicorn_worker/_workers.py#L39-L40

Does that mean that the uvicorn-worker dependency should be also skipped on Windows, like the direct gunicorn dependency is?

functions-framework-python/pyproject.toml

Line 29 in d13d9aa

"gunicorn>=22.0.0; platform_system!='Windows'",