"Update Deps and Codegen" action takes long time

[nak3]

Since knative and knative-sandbox have a lot of repositories, the "Update Deps and Codegen" action takes too long time.
It is no problem on normal days but we need to kick the action at least twice on the release day and it blocks our work.

Is it not alright to split some repositories (e.g. knative and knative-sandbox) for the action OR increase max-parallel?:

https://github.com/knative-sandbox/knobots/blob/aeeeea502d70b076485f34c1e348c1101a46391a/.github/workflows/auto-update-deps.yaml#L68