fix(cluster): never take a live server's S3 lock - #1217

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: mozilla-actions/sccache-action@7d986dd989559c6ecdb630a3fd2557667be217ad. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

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