Update some deps in v0.6 branch

[simonbaird]

Ref: https://redhat.atlassian.net/browse/EC-1766

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[simonbaird]

I think it's nearly impossible to update the tekton and buildkit dependencies, so I've back those out and simplified this PR. If it goes green we can merge and call it the final v0.6 builds, since v0.6 branch is about to be retired.