[chore] flake.lock: update inputs

Flake lock file updates:

• Updated input 'flake-parts':
    'github:hercules-ci/flake-parts/506278e768c2a08bec68eb62932193e341f55c90' (2024-11-01)
  → 'github:hercules-ci/flake-parts/e37654df08605b510ad84eceaafcc7248495e843' (2024-12-03)
• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/62c435d93bf046a5396f3016472e8f7c8e2aed65' (2024-11-30)
  → 'github:NixOS/nixpkgs/f9f0d5c5380be0a599b1fb54641fa99af8281539' (2024-12-02)
• Updated input 'nixvim':
    'github:nix-community/nixvim/e680b367c726e2ae37d541328fe81f8daaf49a6c' (2024-12-02)
  → 'github:nix-community/nixvim/78bfbf7b7eb7a1b6cf42e199547de55a55ba2cea' (2024-12-03)
• Updated input 'treefmt-nix':
    'github:numtide/treefmt-nix/6209c381904cab55796c5d7350e89681d3b2a8ef' (2024-11-29)
  → 'github:numtide/treefmt-nix/49717b5af6f80172275d47a418c9719a31a78b53' (2024-12-03)
• Updated input 'unstable':
    'github:NixOS/nixpkgs/ac35b104800bff9028425fec3b6e8a41de2bbfff' (2024-12-01)
  → 'github:NixOS/nixpkgs/55d15ad12a74eb7d4646254e13638ad0c4128776' (2024-12-03)