Persistent

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- Build Linux binary wheels for Python 3.11.

- Drop support for Python 2.7, 3.5, 3.6.

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- Add support for building arm64 wheels on macOS.

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- Update Python 3.11 support to final release.

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- Update Python 3.11 support to 3.11.0-rc1.

- Disable unsafe math optimizations in C code. See `pull request 176
<https://github.com/zopefoundation/persistent/pull/176>`_.

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- Add support for Python 3.11 (as of 3.11a5).

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- Switch package to src-layout, this is a packaging only change.
(`168 <https://github.com/zopefoundation/persistent/pull/168>`_)
- Add support for Python 3.10.