feat: update flake.lock (#70)

Flake lock file updates:

• Updated input 'nixpkgs':
    'github:nixos/nixpkgs/2ff53fe64443980e139eaa286017f53f88336dd0?narHash=sha256-%2B/bYK3DbPxMIvSL4zArkMX0LQvS7rzBKXnDXLfKyRVc%3D' (2025-02-13)
  → 'github:nixos/nixpkgs/73cf49b8ad837ade2de76f87eb53fc85ed5d4680?narHash=sha256-EO1ygNKZlsAC9avfcwHkKGMsmipUk1Uc0TbrEZpkn64%3D' (2025-02-18)

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Author: github-actions[bot]