Update Nix flake inputs

[github-actions]

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

Flake lock file updates:

• Updated input 'nixpkgs':
    'https://api.flakehub.com/f/pinned/NixOS/nixpkgs/0.1.928726%2Brev-e4bae1bd10c9c57b2cf517953ab70060a828ee6f/019bc8c9-d277-7e35-b3d9-c36e1fdbfb5a/source.tar.gz' (2026-01-16)
  → 'https://api.flakehub.com/f/pinned/NixOS/nixpkgs/0.1.935279%2Brev-bfc1b8a4574108ceef22f02bafcf6611380c100d/019c02ef-f13d-717e-8527-f1603ec205db/source.tar.gz' (2026-01-26)

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