Update root Nix flake inputs

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Automated changes by the update-flake-lock GitHub Action.

Flake lock file updates:

• Updated input 'nixpkgs':
    'https://api.flakehub.com/f/pinned/NixOS/nixpkgs/0.1.861038%2Brev-c23193b943c6c689d70ee98ce3128239ed9e32d1/01994596-722e-716c-b0eb-e6b07d4de75b/source.tar.gz?narHash=sha256-hLEO2TPj55KcUFUU1vgtHE9UEIOjRcH/4QbmfHNF820%3D' (2025-09-13)
  → 'https://api.flakehub.com/f/pinned/NixOS/nixpkgs/0.1.868392%2Brev-e9f00bd893984bc8ce46c895c3bf7cac95331127/01999520-8e0b-7774-aef8-74b2a54b285c/source.tar.gz?narHash=sha256-0m27AKv6ka%2Bq270dw48KflE0LwQYrO7Fm4/2//KCVWg%3D' (2025-09-28)

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