fix: Fix build errors - #86

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: DeterminateSystems/magic-nix-cache-action@4a93660c0d91a55c7449359dddd50cf0d7d789ae. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/