[issue42740] typing.py get_args and get_origin should support PEP 604 and 612

[Ken Jin]

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


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pull_requests: +22808
pull_request: https://github.com/python/cpython/pull/23963

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue42740>
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