Update 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/0.1.897910%2Brev-89c2b2330e733d6cdb5eae7b899326930c2c0648/019a9888-31f2-7667-abe4-5a1c43721ef0/source.tar.gz' (2025-11-17)
  → 'https://api.flakehub.com/f/pinned/NixOS/nixpkgs/0.1.907002%2Brev-f61125a668a320878494449750330ca58b78c557/019af28f-4a47-7f68-a9d7-f6f6e905b8ab/source.tar.gz' (2025-12-05)

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