[issue41559] Add support for PEP 612 (Parameter Specification Variables) to typing.py

[Ken Jin]

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


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pull_requests: +22842
pull_request: https://github.com/python/cpython/pull/24000

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue41559>
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