Test downstream projects

Manually update Codespell and fix new errors. (#1328) #1618

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Run time

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Job	Run time
jupyter_client	5m 49s
ipywidgets	48s
ipyparallel	5m 39s
jupyter_kernel_test	44s
nbclient	2m 2s
qtconsole	1m 32s
spyder_kernels	9s
downstream_check	1s
	16m 44s