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

[miss-islington]

Change by miss-islington <mariatta.wijaya+miss-islington at gmail.com>:


----------
pull_requests: +25578
pull_request: https://github.com/python/cpython/pull/27019

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