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Preliminary support for Python 3.13a3 (#68)

* Preliminary support for Python 3.13a3

* Replace no longer existing function.

See https://docs.python.org/3.13/whatsnew/3.13.html#id11

* Fix tests on Python 3.13.0a3.

In https://github.com/python/cpython/commit/89cee94b3, a persistent_id class method was added to the stdlib Pickler class. This prevents setting it as an instance attribute.

As a workaround, I updated the tests to use a custom Pickler subclass that overrides the persistent_id method.

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Co-authored-by: David Glick <david@glicksoftware.com>

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