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/0.1.889928%2Brev-ae814fd3904b621d8ab97418f1d0f2eb0d3716f4/019a5bef-29b7-7023-9317-10e3a34588a3/source.tar.gz?narHash=sha256-YRqMDEtSMbitIMj%2BJLpheSz0pwEr0Rmy5mC7myl17xs%3D' (2025-11-05)
  → 'https://api.flakehub.com/f/pinned/NixOS/nixpkgs/0.1.895122%2Brev-c5ae371f1a6a7fd27823bc500d9390b38c05fa55/019a8033-d30e-74f8-b032-9a8d8b235b89/source.tar.gz?narHash=sha256-4PqRErxfe%2B2toFJFgcRKZ0UI9NSIOJa%2B7RXVtBhy4KE%3D' (2025-11-12)

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