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/0.1.953160%2Brev-2fc6539b481e1d2569f25f8799236694180c0993/019c8e05-d2f6-7c7e-9ead-612154b18bfb/source.tar.gz' (2026-02-23)
  → 'https://api.flakehub.com/f/pinned/NixOS/nixpkgs/0.1.955442%2Brev-dd9b079222d43e1943b6ebd802f04fd959dc8e61/019ca676-94a3-7d2e-926b-6895b52ae515/source.tar.gz' (2026-02-27)

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