docs(backups): fix data dump so it restores, use the session pooler, add a restore check - #458

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v3, actions/setup-node@v3.7.0. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

Failed to save: <h2>Our services aren't available right now</h2><p>We're working to restore all services as soon as possible. Please check back soon.</p>0d6boagAAAAAo4ytPUMyHRpAZE0IzLyzjTVNQMzExMDAwMTAzMDA5AEVkZ2U=

Failed to restore: Cache service responded with 400