feat: remove requirements in favor of auto-detection - #2508

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: DeterminateSystems/flake-checker-action@3164002371bc90729c68af0e24d5aacf20d7c9f6, DeterminateSystems/nix-installer-action@45a18a69953f27af3c2bfad0a5e01c38ef2da462. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/