Test downstream projects

Fix matplotlib eventloops #2142

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Run time

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Job	Run time
nbclient	2m 13s
ipywidgets	1m 32s
jupyter_client	5m 31s
jupyter_kernel_test	44s
ipyparallel	5m 44s
qtconsole	2m 34s
spyder_kernels	-1s
	18m 17s