`SelectorEventLoop` on Windows does not support subprocesses
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Description
Due to an old issue with `tornado<6.1`, we are currently using the `SelectorEventLoop` on Windows. However, that event loop does not support subprocesses. This causes the `SubprocessCluster` in #7431 to not support Windows.
Upgrading to `tornado>=6.1` should allow us to use the default `ProActorEventLoop` (see #5833 for a dormant PR on this).
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