flake.lock: Update

Flake lock file updates:

• Updated input 'flake-parts':
    'github:hercules-ci/flake-parts/07f6395285469419cf9d078f59b5b49993198c00' (2024-01-11)
  → 'github:hercules-ci/flake-parts/60c614008eed1d0383d21daac177a3e036192ed8' (2024-01-29)
• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/b43bb235efeab5324c5e486882ef46749188eee2' (2024-01-23)
  → 'github:NixOS/nixpkgs/5ad9903c16126a7d949101687af0aa589b1d7d3d' (2024-01-31)
• Updated input 'treefmt-nix':
    'github:numtide/treefmt-nix/3139f18ee5cf16ea2b291a717c06f1e66df3e908' (2024-01-25)
  → 'github:numtide/treefmt-nix/c6153c2a3ff4c38d231e3ae99af29b87f1df5901' (2024-01-28)