Update flake.lock

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

Flake lock file updates:

• Updated input 'nixpkgs':
    'github:nixos/nixpkgs/7df7ff7' (2025-10-02)
  → 'github:nixos/nixpkgs/bfc1b8a' (2026-01-26)

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