flake.lock: Update

Flake lock file updates:

• Updated input 'git-hooks':
    'github:cachix/git-hooks.nix/bfef0ada09e2c8ac55bbcd0831bd0c9d42e651ba' (2024-08-16)
  → 'github:cachix/git-hooks.nix/6cedaa7c1b4f82a266e5d30f212273e60d62cb0d' (2024-08-21)
• Updated input 'nix-darwin':
    'github:lnl7/nix-darwin/076b9a905af8a52b866c8db068d6da475839d97b' (2024-08-17)
  → 'github:lnl7/nix-darwin/a8968d88e5a537b0491f68ce910749cd870bdbef' (2024-08-22)
• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/8a3354191c0d7144db9756a74755672387b702ba' (2024-08-18)
  → 'github:NixOS/nixpkgs/c374d94f1536013ca8e92341b540eba4c22f9c62' (2024-08-21)