[issue32592] Drop support of Windows Vista and 7 in Python 3.9

[Roundup Robot]

Change by Roundup Robot <devnull at psf.upfronthosting.co.za>:


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nosy: +python-dev
nosy_count: 10.0 -> 11.0
pull_requests: +21578
pull_request: https://github.com/python/cpython/pull/22586

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue32592>
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