chore(nix): Update dependencies.

Flake lock file updates:

• Updated input 'nix-darwin':
    'github:LnL7/nix-darwin/9e7c20ffd056e406ddd0276ee9d89f09c5e5f4ed' (2024-04-19)
  → 'github:LnL7/nix-darwin/230a197063de9287128e2c68a7a4b0cd7d0b50a7' (2024-04-24)
• Updated input 'nixos-generators':
    'github:nix-community/nixos-generators/d942db8df8ee860556a38754f15b8d03bf7e6933' (2024-04-08)
  → 'github:nix-community/nixos-generators/722b512eb7e6915882f39fff0e4c9dd44f42b77e' (2024-04-22)
• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/d764f230634fa4f86dc8d01c6af9619c7cc5d225' (2024-04-18)
  → 'github:NixOS/nixpkgs/4c86138ce486d601d956a165e2f7a0fc029a03c1' (2024-04-26)
• Updated input 'pre-commit-hooks-nix':
    'github:cachix/pre-commit-hooks.nix/40e6053ecb65fcbf12863338a6dcefb3f55f1bf8' (2024-04-12)
  → 'github:cachix/pre-commit-hooks.nix/6fb82e44254d6a0ece014ec423cb62d92435336f' (2024-04-24)
• Updated input 'treefmt-nix':
    'github:numtide/treefmt-nix/49dc4a92b02b8e68798abd99184f228243b6e3ac' (2024-04-01)
  → 'github:numtide/treefmt-nix/c6aaf729f34a36c445618580a9f95a48f5e4e03f' (2024-04-25)