dask / dask/distributed

test_no_dangling_asyncio_tasks is flaky on my local box (not on CI)

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flaky test
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Description

Ubuntu 20.04 desktop
distributed 2022.03.0

``test_scheduler.py::test_no_dangling_asyncio_tasks`` fails 20~40 times out of 1000, leaking the task

cb=[IOLoop.add_future..() at /home/crusaderky/miniconda3/envs/distributed39/lib/python3.9/site-packages/tornado/ioloop.py:688]>

I've never observed this on CI, possibly due to the fact that CI is a lot slower CPU-wise.

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