Updated releases.md for v0.66.0

[afrittoli]

Changes

/kind documentation

Submitter Checklist

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

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• Has Tests included if any functionality added or changed
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• Release notes contains the string "action required" if the change requires additional action from users switching to the new release

Release Notes

NONE

[vdemeester]

/lgtm

[tekton-robot]

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