Pin GitHub Actions to full-length commit SHAs - #120

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@11d5960a326750d5838078e36cf38b85af677262, actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020, astral-sh/setup-uv@caf0cab7a618c569241d31dcd442f54681755d39, pnpm/action-setup@a3252b78c470c02df07e9d59298aecedc3ccdd6d. 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>0Y7Z8agAAAAA3hNxnrcPlT549pZqdcOYEUEhYMzFFREdFMDYwOQBFZGdl