[Policy Assistant] use internal vendoring instead of vendoring from Cyclonus

[huntergregory]

Related to #150.

See https://github.com/kubernetes-sigs/network-policy-api/pull/159#discussion_r1374029219

[k8s-triage-robot]

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/lifecycle stale

[huntergregory]

/remove-lifecycle stale

[k8s-triage-robot]

The Kubernetes project currently lacks enough contributors to adequately respond to all issues.

This bot triages un-triaged issues according to the following rules:

• After 90d of inactivity, lifecycle/stale is applied
• After 30d of inactivity since lifecycle/stale was applied, lifecycle/rotten is applied
• After 30d of inactivity since lifecycle/rotten was applied, the issue is closed

You can:

• Mark this issue as fresh with /remove-lifecycle stale
• Close this issue with /close
• Offer to help out with Issue Triage

Please send feedback to sig-contributor-experience at kubernetes/community.

/lifecycle stale

[huntergregory]

/remove-lifecycle stale