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

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

> Steve, in PR 15951 you updated Py_WINVER to 0x0602. I think it should be 0x0603 (_WIN32_WINNT_WINBLUE) and Py_NTDDI should be NTDDI_WINBLUE. Windows 8 hasn't been supported since 2016. Windows 8.1 is supported until 2023.

Dropping Windows 7 support allows us to remove code to support Windows 7.

I'm not sure that there is a big benefit for us to drop Windows 8 support (only Windows 8 but continue to support Windows 8.1), compared to the annoyance for users.

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