[issue44562] types.GenericAlias should decref instead of using delete in tp_new

[Ken Jin]

Change by Ken Jin <kenjin4096 at gmail.com>:


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pull_requests: +25587
pull_request: https://github.com/python/cpython/pull/27028

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue44562>
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