[issue42212] Check if generated files are up-to-date in Github Actions

[Neil Schemenauer]

Change by Neil Schemenauer <nas-python at arctrix.com>:


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nosy: +nascheme
nosy_count: 3.0 -> 4.0
pull_requests: +23486
pull_request: https://github.com/python/cpython/pull/24708

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue42212>
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