Update prow to v20200212-1f7b8ac1d

[knative-prow-updater-robot]

Info:
There's no new version for image gcr.io/k8s-prow/commenter, keeping version: 'gcr.io/k8s-prow/commenter:v20190731-e3f7b9853'.

Please check Prow release notes to make sure there are no breaking changes.
/assign @chizhg

[knative-prow-robot]

Hi @knative-prow-updater-robot. Thanks for your PR.

I'm waiting for a knative 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.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[chizhg]

/ok-to-test
/lgtm
/approve

[knative-prow-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: chizhg, knative-prow-updater-robot

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• OWNERS [chizhg]

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