Test downstream projects

Backport: Remove links in changelog to github milestones that no longer exist #2010

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Run time

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Job	Run time
nbclient	2m 9s
ipywidgets	58s
ipyparallel	5m 32s
jupyter_client	6m 39s
qtconsole	2m 47s
spyder_kernels	1m 50s
jupyter_kernel_test	47s
	20m 42s