./hack/update-deps.sh needs rework

[vdemeester]

It is not up-to-date, and not necessarily relied on to do anything anymore (except validating the vendor folder is up-to-date).
We need to refine the way we update our deps, and most likely rely as much as we can on go.mod.

/kind misc

[tekton-robot]

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/lifecycle stale

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[tekton-robot]

Stale issues rot after 30d of inactivity.
Mark the issue as fresh with /remove-lifecycle rotten with a justification.
Rotten issues close after an additional 30d of inactivity.
If this issue is safe to close now please do so with /close with a justification.
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/lifecycle rotten

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[tekton-robot]

Rotten issues close after 30d of inactivity.
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/close

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