Merge pull request #3324 from jupyterhub/update-image-kube-scheduler #2226

Job	Run time
lint_and_validate_rendered_templates	11s
test (latest, install)	1m 59s
lint_and_validate_templates_with_schema	13s
test (stable, install, --set hub.image.name=quay.io/jupyterhub/k8s-hub-slim --set prePuller.hook....	2m 10s
lint_shell_scripts	45s
lint_and_validate_templates_with_schema (v3.5.0)	17s
test (v1.28, install, --set hub.existingSecret=test-hub-existing-secret --set proxy.secretToken=a...	1m 58s
test (v1.27, upgrade, stable, --set proxy.secretToken=aaaa1111 --set hub.cookieSecret=bbbb2222 --...	2m 40s
test (v1.26, upgrade, dev, --set proxy.secretToken=aaaa1111 --set hub.db.type=sqlite-pvc --set si...	2m 54s
test (v1.25, upgrade, 2.0.0, --set proxy.secretToken=aaaa1111 --set hub.cookieSecret=bbbb2222 --s...	3m 4s
	16m 11s

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