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.

[knative-prow]

There are empty aliases in OWNER_ALIASES, cleanup is advised.

[psschwei]

@dprotaso came up with a less heavy solution -- have an action check the current min k8s version in pkg and compare to what we have here. that should let us catch when knobots opens update deps PRs, which will fire at least once before each release, so we should be covered.