Consistent test failures in test test_asyncio.test_streams.test_drain_raises on Windows

[Fidget-Spinner]

Run python_d.exe -m test test_asyncio -m test_drain_raises -F on Windows. The test eventually fails after some repetitions.

The problem is that _call_connection_lost can be called multiple times, even after the socket by the proactortransport is closed. So it's calling close() on something that is already set to None.

I have a PR to fix it.

[Fidget-Spinner]

@pablogsal sorry to bother you right after the monumental 3.11 release (thanks for that by the way!). However, I'm setting this as release blocker as it's causing the Windows Buildbots to occasionally fail https://buildbot.python.org/all/#/builders/146.

I have already created a PR to fix this.

[pablogsal]

Thanks a lot @Fidget-Spinner 🙏