Test downstream projects

Relax timings of subshell tests #1861

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Run time

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Job	Run time
ipywidgets	43s
jupyter_client	6m 3s
ipyparallel	17m 4s
jupyter_kernel_test	37s
nbclient	2m 15s
qtconsole	1m 39s
spyder_kernels	1m 40s
	30m 1s