[issue21566] make use of the new default socket.listen() backlog argument

[Charles-François Natali]

Charles-François Natali added the comment:

> Maybe we should keep listen(1) in some cases.
>
> For socketpair() of asyncio.windows_utils, it makes sense to use sock.listen(1) since we expect exactly one request from one client. The listening socket is closed just after sock.accept().

Yeah, I thought about that, but almost all operating systems don't
strictly respect the backlog, they always increase it a bit, so this
wouldn't change much.

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