use knative/pkg for minimum k8s version

[psschwei]

Changes

• 🧹 use knative/pkg for minimum k8s version
• 🧹 increases minimum kind version to v0.30
• 🧹 increases minimum minikube version to v1.37

/kind cleanup

Fixes #644

Release Note

Sources the minimum kubernetes version from knative/pkg, to keep in sync with the 
rest of the project. Also increases minimum kind version to v0.30, and increases minimum 
minikube version to v1.37.

[knative-prow]

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[knative-prow]

There are empty aliases in OWNER_ALIASES, cleanup is advised.

[knative-prow]

There are empty aliases in OWNER_ALIASES, cleanup is advised.

[dprotaso]

what's pulling in all these deps now?

[psschwei]

what's pulling in all these deps now?

adding pkg

But the CI was failing because of some issue with a hashicorp package that somehow got added back when client-pkg was archived... I dropped it and now we're all green.