[github-actions]

Updates the dns plugin manifest to release v0.13.0 of datum-cloud/dns-operator.

Every platform's download URL now points at the v0.13.0 release assets, and each sha256 was refreshed from that release's checksums.txt. Catalog CI will validate the schema, resolve each URL, and verify each checksum.

The catalog index.yaml is regenerated automatically from plugins/*.yaml when this merges.

What's in this release: https://github.com/datum-cloud/dns-operator/releases/tag/v0.13.0

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[cla-assistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}