Revert "Update Prow to v20210924-1544aef1b6" #3584
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Reverts #3580
The timing of this exactly correlates to istio/istio#35384; see https://testgrid.k8s.io/istio_istio#integ-security-k8s-tests_istio&exclude-non-failed-tests=20&width=20.
Note: it sounds very likely its NOT a prow issue but a GKE issue. However, since this occurred at literally the exact same time as the prow bump, revert seems like a reasonable first step. See kubernetes/test-infra#23741