Action and dep fixes - #1990

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: DeterminateSystems/nix-installer-action@428f3c64a3f56011a8bfb3044a519374aff8e7df. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/