Extensionclass

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- Add support for Python 3.12.

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- Drop support for Python 2.7, 3.5, 3.6.

- Fix deprecation warning in tests.

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- Add support for building arm64 wheels on macOS.

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- Update Python 3.11 support to the final release.

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- Update Python 3.11 support to rc2.

- Disable unsafe math optimizations in C code.
(`55 <https://github.com/zopefoundation/ExtensionClass/pull/55>`_)