Setup process/automation to bump hub/api package dependencies

[dprotaso]

It seems like hub/api wasn't keeping it's dependencies up to date ie. bumpingtektoncd/pipeline

see: 6402cc3

I've dropped require directives for k8s deps across tekton but for updates to get picked up it needs all ancestor dependencies to regularly bump.

Given that the hub/api package is imported by the cli we should regularly keep dependencies up to date. Specifically that means something should bump github.com/tektoncd/pipeline and everything else will follow.

[vdemeester]

/kind feature
/area plumbing

[tekton-robot]

Issues go stale after 90d of inactivity.
Mark the issue as fresh with /remove-lifecycle stale with a justification.
Stale issues rot after an additional 30d of inactivity and eventually close.
If this issue is safe to close now please do so with /close with a justification.
If this issue should be exempted, mark the issue as frozen with /lifecycle frozen with a justification.

/lifecycle stale

Send feedback to tektoncd/plumbing.

[dprotaso]

/lifecycle frozen