[issue47182] _PyUnicode_Fini should invalidate ucnhash_capi capsule pointer

[Christian Heimes]

Change by Christian Heimes <lists at cheimes.de>:


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versions:  -Python 3.7, Python 3.8, Python 3.9

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue47182>
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