Test downstream projects

Drop Python 3.8, update Python versions in tests (#1044) #1251

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Run time

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Job	Run time
nbclient	1m 58s
jupyter_server	3m 58s
jupyter_kernel_test	1m 55s
ipykernel	43s
nbconvert	2m 16s
papermill	2m 8s
qtconsole	1m 53s
downstreams_check	2s
	14m 53s