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

[Jim Fasarakis-Hilliard]

Changes by Jim Fasarakis-Hilliard <d.f.hilliard at gmail.com>:


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components: +Tests -Library (Lib)

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