ci: Replace arduino/setup-protoc with direct download #643
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Replace the arduino/setup-protoc GitHub Action with direct curl download from GitHub releases to avoid intermittent API timeout errors.
The action queries GitHub's API to list releases, which can timeout due to rate limiting or API instability on shared runners. Direct download from a known release URL bypasses the API entirely.
Using protoc v33.2 since we were already using latest version.
Example error: https://github.com/Moonsong-Labs/storage-hub/actions/runs/20828894844/job/59838287633?pr=642#step:7:20