chore: remove compute windows on arm build

[savme]

The compute plugin's catalog listing is pointing at a Windows arm64 download that compute's release workflow does not publish. Every release of the compute plugin is failing to update the catalog, because the automation refuses to publish a listing referencing a file that does not exist. This removes that stale entry so the plugin can be installed and updated normally on every supported platform, and matches how the DNS plugin's listing is already structured.

https://github.com/datum-cloud/compute/actions/runs/34162495797/job/101867677207

Test plan

• Confirm the compute entry now lists only the platforms compute actually publishes
• Confirm the generated catalog index still parses and lists all plugins after merge
• Re-run the compute release automation and confirm the catalog update step succeeds
• Confirm datumctl plugin install still resolves correctly for supported compute platforms (Linux, macOS, Windows x86_64)