feat: update flake.lock (#71)

Flake lock file updates:

• Updated input 'nixpkgs':
    'github:nixos/nixpkgs/73cf49b8ad837ade2de76f87eb53fc85ed5d4680?narHash=sha256-EO1ygNKZlsAC9avfcwHkKGMsmipUk1Uc0TbrEZpkn64%3D' (2025-02-18)
  → 'github:nixos/nixpkgs/6313551cd05425cd5b3e63fe47dbc324eabb15e4?narHash=sha256-D%2BR%2BkFxy1KsheiIzkkx/6L63wEHBYX21OIwlFV8JvDs%3D' (2025-02-27)

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Author: github-actions[bot]