[issue28624] Make the `cwd` argument to `subprocess.Popen` accept a `PathLike`

[Sayan Chowdhury]

New submission from Sayan Chowdhury:

I tested and found that the code already works with PathLike. I have created a PR which updates the test and documentation. I think the issue can be in Windows.

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nosy: +sayanchowdhury

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue28624>
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