Update flake.lock

Automated changes by the [update-flake-lock](https://github.com/DeterminateSystems/update-flake-lock) GitHub Action. ``` Flake lock file updates: • Updated input 'nixpkgs': 'https://api.flakehub.com/f/pinned/NixOS/nixpkgs/0.2505.811339%2Brev-98ff3f9af2684f6136c24beef08f5e2033fc5389/0199f1c4-90e9-7ed2-82ed-b63a2a32192a/source.tar.gz?narHash=sha256-/YdfibIrnqXAL8p5kqCU345mzpHoOtuVIkMiI2pF4Dc%3D' (2025-10-16) → 'https://api.flakehub.com/f/pinned/NixOS/nixpkgs/0.2505.811621%2Brev-c8aa8cc00a5cb57fada0851a038d35c08a36a2bb/019a15c4-323b-7add-9142-f9d3e1570c17/source.tar.gz?narHash=sha256-m9W0dYXflzeGgKNravKJvTMR4Qqa2MVD11AwlGMufeE%3D' (2025-10-22) ``` ### Running GitHub Actions on this PR GitHub Actions will not run workflows on pull requests which are opened by a GitHub Action. **To run GitHub Actions workflows on this PR, close and re-open this pull request.**