Pkgcore

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- distutils_extensions: fix pip detection for editable installs (arthurzam)
- ci: Update cibuildwheel - should fix generation of wheels for CPython 3.10 and PyPy 3.9 (arthurzam)
- fix and port snakeoil to Python 3.11 (arthurzam, thesamesam, 73)

- Remove ``TempDir`` and ``RandomPath`` test fixtures. (arthurzam, 66)
In case you used those those fixtures, migrate to ``tmp_path`` and ``tmp_path / random_str(10)``
- osutil: ``sizeof_fmt()`` improvements and tests addition (mgorny, 67)
- Fix distutils extension compatibility with setuptools. (thesamesam, arthurzam)
- Force newer required version of ``cython``, so a Python 3.11 compatible ``.c`` is generated (arthurzam)