README.md: fix Kubernetes min version

[vdemeester]

Changes

When upgrading knative/pkg to 1.14, the update on the README was
wrongly done, so this is fixing it.

Signed-off-by: Vincent Demeester vdemeest@redhat.com

/kind misc

Submitter Checklist

As the author of this PR, please check off the items in this checklist:

• Has Docs if any changes are user facing, including updates to minimum requirements e.g. Kubernetes version bumps
• Has Tests included if any functionality added or changed
• pre-commit Passed
• Follows the commit message standard
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• Has a kind label. You can add one by adding a comment on this PR that contains /kind <type>. Valid types are bug, cleanup, design, documentation, feature, flake, misc, question, tep
• Release notes block below has been updated with any user facing changes (API changes, bug fixes, changes requiring upgrade notices or deprecation warnings). See some examples of good release notes.
• Release notes contains the string "action required" if the change requires additional action from users switching to the new release

Release Notes

NONE

[nickmango]

/easycla

[chitrangpatel]

/lgtm

[tekton-robot]

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[vdemeester]

/retest

[vdemeester]

/retest

[vdemeester]

Are those 2 alpha and beta integration tests failing everywhere?

[vdemeester]

/retest