Update prometheus-operator to support k8sv >= 1.16.0

[flouthoc]

Following PR is a addon PR similar to : #7067 , which adds latest supported prometheus-operator for k8sv >= 1.16.0 to kops addons.

[k8s-ci-robot]

Hi @flouthoc. Thanks for your PR.

I'm waiting for a kubernetes member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[flouthoc]

/assign @chrisz100

[flouthoc]

@chrisz100 Could you please take a look, adding you since you reviewed previous PR related to addons.

[flouthoc]

/assign @rifelpet

[chrisz100]

/ok-to-test
/lgtm

[flouthoc]

@chrisz100 I think tide test needs approved label.

[hakman]

Thanks @flouthoc .
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: flouthoc, hakman

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