Test

Refreeze dask-gateway/Dockerfile.requirements.txt (#860) #925

Job	Run time
Test hadoop backend	2m 10s
Test k8s backend & chart with traefik installed	6m 17s
Test pbs backend	1m 28s
Test slurm backend	1m 13s
Test k8s backend & chart (v1.29, separate-namespace)	6m 24s
main-tests (3.10, 1.20)	2m 30s
Test k8s backend & chart (v1.30, default, 2022.4.0)	6m 33s
Test k8s backend & chart (v1.31, default)	6m 22s
main-tests (3.11, 1.20)	2m 37s
Test k8s backend & chart (v1.32, default)	6m 10s
main-tests (3.12, 1.21)	2m 32s
Test k8s backend & chart (stable, default)	6m 18s
main-tests (3.13, 1.21)	2m 26s
	53m 0s

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