website: update kf version shipped by prokube

[geier]

Description of Changes

Update the version of kubeflow that get's shipped by prokube, see the prokube docs for evidence.

Related Issues

Related: #4429

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[google-oss-prow]

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[google-oss-prow]

Hi @geier. Thanks for your PR.

I'm waiting for a kubeflow 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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[christian-heusel]

/lgtm
/ok-to-test

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Approvals successfully granted for pending runs.