Watch dependencies #48616

Job	Run time
update-singleuser-image	15s
check-dask-image	16s
update-chart-dep (0, jupyterhub, https://github.com/jupyterhub/zero-to-jupyterhub-k8s/blob/master...	10s
update-chart-dep (1, dask-gateway, https://gateway.dask.org/changelog.html)	13s
	54s

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