[issue41123] Remove Py_UNICODE APIs except PEP 623

[Inada Naoki]

Inada Naoki <songofacandy at gmail.com> added the comment:

PyUnicode_AsUnicodeCopy is not used in top 4000 packages.  Let's remove it too.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue41123>
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