flake.lock: Update

Flake lock file updates:

• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/79a13f1437e149dc7be2d1290c74d378dad60814' (2024-02-03)
  → 'github:NixOS/nixpkgs/f8e2ebd66d097614d51a56a755450d4ae1632df1' (2024-02-07)
• Updated input 'pre-commit-hooks':
    'github:cachix/pre-commit-hooks.nix/7c54e08a689b53c8a1e5d70169f2ec9e2a68ffaf' (2024-01-28)
  → 'github:cachix/pre-commit-hooks.nix/0db2e67ee49910adfa13010e7f012149660af7f0' (2024-02-07)
• Updated input 'treefmt-nix':
    'github:numtide/treefmt-nix/c6153c2a3ff4c38d231e3ae99af29b87f1df5901' (2024-01-28)
  → 'github:numtide/treefmt-nix/ac599dab59a66304eb511af07b3883114f061b9d' (2024-02-07)