[issue24373] Use traverse & finalize in xxlimited and in PEP 489 tests

[Nick Coghlan]

Nick Coghlan added the comment:

Would it also be worth making at docs update to tp_dealloc, suggesting the use of tp_traverse/finalize?: https://docs.python.org/3/c-api/typeobj.html#c.PyTypeObject.tp_dealloc

And perhaps from PyType_FromSpec? https://docs.python.org/3/c-api/type.html?highlight=pytype_fromspec#c.PyType_FromSpec

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