Test downstream projects

Backports from `anyio` (old `main`) branch to `main` branch #1984

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Run time

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Job	Run time
qtconsole	3m 8s
jupyter_kernel_test	43s
spyder_kernels	1m 52s
ipywidgets	51s
ipyparallel	5m 33s
jupyter_client	6m 15s
nbclient	2m 19s
	20m 41s