Slotscheck

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- Explicit Python 3.13 support, drop Python 3.8 support
- Documentation improvements

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- Improved support for implicit/native namespace packages (228, 230)

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- Improved robustness of importing of namespace packages and built-in modules (227)

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- Fix packaging metadata issue where README/CHANGELOG were installed to the
wrong location.

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- Remove Python upper version constraint in package metadata

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- Fixed ``Generic`` false positive in Python 3.12+ (201).
- Remove ``pkgutil`` deprecation warning on Python 3.12+.
- Official Python 3.12 support.