[flaky] pkg/activator/net: TestProbePodIPs

[dprotaso]

Failed here https://prow.knative.dev/view/gs/knative-prow/pr-logs/pull/knative_serving/15132/unit-tests_serving_main/1780553267411947520

 === RUN   TestProbePodIPs
    revision_backends_test.go:1788: TestProbePodIPs/one_pod_fails_probe: Healthy does not match, got map[10.10.1.3:{}], want map[10.10.1.2:{} 10.10.1.3:{}] diff:   sets.Set[string](
        - 	{"10.10.1.3": {}},
        + 	{"10.10.1.2": {}, "10.10.1.3": {}},
          )
--- FAIL: TestProbePodIPs (0.35s) 

[github-actions]

This issue is stale because it has been open for 90 days with no
activity. It will automatically close after 30 more days of
inactivity. Reopen the issue with /reopen. Mark the issue as
fresh by adding the comment /remove-lifecycle stale.

[dprotaso]

Still flaky - another run

https://prow.knative.dev/view/gs/knative-prow/pr-logs/pull/knative_serving/15400/unit-tests_serving_main/1815342425837670400

[github-actions]

This issue is stale because it has been open for 90 days with no
activity. It will automatically close after 30 more days of
inactivity. Reopen the issue with /reopen. Mark the issue as
fresh by adding the comment /remove-lifecycle stale.