[issue32710] test_asyncio: ProactorEventLoopTests sendfile tests leak references on Windows

[STINNER Victor]

STINNER Victor <vstinner at redhat.com> added the comment:

I ran test_asyncio refleak hunting on Windows, and there is no more leak!

vstinner at WIN C:\vstinner\python\master>python -m test test_asyncio -R 3:3 
(...)
Total duration: 13 min 24 sec
Tests result: SUCCESS

I will close this PR once the 3.7 backport is merged.

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