Remove minimum Kubernetes version requirement from prerequisites

[mrgiles]

Removes the "Your Kubernetes server must be at or later than version 1.5." from the prerequisites. Fixes #40453

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[tengqm]

This makes good sense.
/lgtm
/approve

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[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 661b50ae2042f4e1cc809bb0ea3c35f231b0bf48