Fixed: use dl.k8s.io, not kubernetes-release bucket

[johntylerrupert]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

There are still references to https://storage.googleapis.com/kubernetes-release instead of https://dl.k8s.io/

dl.k8s.io is the correct advertised download host and will eventually move to be fastly shielding a fully community-owned bucket

ref: kubernetes/k8s.io#2396

[linux-foundation-easycla]

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[rjsadow]

/lgtm
/ok-to-test
Thanks @johntylerrupert!!

[jkh52]

/approve

Thanks!

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jkh52, johntylerrupert

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