Add os_name environment marker for platform-dependent pypi dependencies

[scottyhq]

fixes #293

Adds the "os_name" environment marker (https://peps.python.org/pep-0508/#environment-markers) used by some packages to mark platform-specific dependencies, for example jupyter_server:

requires-python = ">=3.8"
dependencies = [
    "anyio>=3.1.0,<4",
    "pywinpty;os_name=='nt'",

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[scottyhq]

Hmmm, test_run_lock_blas_mkl[micromamba] is failing just on Windows and i'm not sure how to remedy...

E               KeyError: 'md5'
D:\a\conda-lock\conda-lock\conda_lock\conda_solver.py:282: KeyError

full traceback in the CI logs here

[mariusvniekerk]

Probably just some weird edge case to ignore, I've seen micromamba on windows have some rather exotic behavior

[scottyhq]

OK @mariusvniekerk let me know if there are any changes I can make to merge this in

[maresb]

Sorry for the review delay. This looks good to me. Would it be possible to add #293 as a test case?

Note: the os_name marker is set to os.name which is either posix or nt as per the os builtin module.

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