[Pipelines] Specify KFP SDK version where new caching flag will be available

[jgarciao]

As the changes introduced in kubeflow/pipelines#11222 are in master but not in KFP 2.9.0 SDK, modify the Use Caching page to specify when then new caching flag will be available

[google-oss-prow]

Hi @jgarciao. 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.

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[hbelmiro]

/lgtm

[DharmitD]

/lgtm

[hbelmiro]

/ok-to-test

[google-oss-prow]

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