Persistent

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- Nothing changed yet.

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- Use ``Py_REFCNT`` to access ``cPersistentObject`` reference counts in
assertions.

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- Add final support for Python 3.13.

- Removed ``persistent.cPersistence.simple_new`` fossil.
See https://github.com/zopefoundation/persistent/pull/208

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- Drop support for Python 3.7.

- Build Windows wheels on GHA.

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- Add preliminary support for Python 3.13a3.

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- Add support for Python 3.12.