Use dl.k8s.io instead of kubernetes-release bucket

[askulkarni2]

What this PR does / why we need it:

Part of umbrella issues to migrate the kubernetes project away from use of GCP project google-containers: kubernetes/k8s.io#1571 and kubernetes/k8s.io#2396

How does this change affect the cardinality of KSM: (increases, decreases or does not change cardinality)
Does not change.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

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[mrueg]

/lgtm

Thanks for your contribution!

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: askulkarni2, mrueg

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