Update to latest knative.dev/pkg

[mattmoor]

This pulls in some code-generation changes, and I wanted to make sure it didn't break Tekton.

/kind cleanup

Submitter Checklist

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

• Docs included if any changes are user facing
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[mattmoor]

cc @n3wscott who reviewed the upstream change to PKG

[n3wscott]

/lgtm

This is updating the codegen from knative/pkg updates from knative/pkg#2210.

[tekton-robot]

@n3wscott: changing LGTM is restricted to collaborators

In response to this:

/lgtm

This is updating the codegen from knative/pkg updates from knative/pkg#2210.

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[imjasonh]

/lgtm

[dlorenc]

/approve

[tekton-robot]

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[mattmoor]

/retest

Looks like a flake