Use str instead of bytes to make mypy and pycharm happy
Use str instead of bytes to make mypy and pycharm happy

Judging by the implementation[1], it should not make any difference.
However, stubs and mypy seem to agree that one ought to pass a `str`.

[1] https://github.com/python/cpython/blob/f07adf82f338ebb7e69475537be050e63c2009fa/Modules/clinic/posixmodule.c.h#L9585-L9587

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