[github-actions]

Updates the compute plugin manifest to release v0.14.3 of datum-cloud/compute.

Every platform's download URL now points at the v0.14.3 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/compute/releases/tag/v0.14.3

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