[issue45919] Use WinAPI GetFileType() in is_valid_fd()

[Dong-hee Na]

Change by Dong-hee Na <donghee.na at python.org>:


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keywords: +patch
nosy: +corona10
nosy_count: 5.0 -> 6.0
pull_requests: +28303
stage: needs patch -> patch review
pull_request: https://github.com/python/cpython/pull/30082

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue45919>
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