test(kubeflow): fix kubeflow-pipelines-postsubmits.yaml

[Bobgy]

Part of kubeflow/pipelines#5178

/assign @numerology @chensun

[numerology]

/lgtm
/approve

Thanks!

[google-oss-robot]

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[google-oss-robot]

@Bobgy: Updated the job-config configmap in namespace default at cluster default using the following files:

• key kubeflow-pipelines-postsubmits.yaml using file prow/prowjobs/kubeflow/pipelines/kubeflow-pipelines-postsubmits.yaml

In response to this:

Part of kubeflow/pipelines#5178

/assign @numerology @chensun

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