flake.lock: Update

Flake lock file updates:

• Updated input 'flake-utils':
    'github:numtide/flake-utils/93a2b84fc4b70d9e089d029deacc3583435c2ed6' (2023-03-15)
  → 'github:numtide/flake-utils/ff7b65b44d01cf9ba6a71320833626af21126384' (2023-09-12)
• Added input 'flake-utils/systems':
    'github:nix-systems/default/da67096a3b9bf56a91d16901293e51ba5b49a27e' (2023-04-09)
• Updated input 'nixos-org-configurations':
    'github:NixOS/nixos-org-configurations/083c137b7ae19a1a8d6822fea7ca30aeeda72ac8' (2023-07-03)
  → 'github:NixOS/nixos-org-configurations/81d1522122dfff20325f8cafb85955a91f1e0a93' (2023-10-20)
• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/e3652e0735fbec227f342712f180f4f21f0594f2' (2023-03-30)
  → 'github:NixOS/nixpkgs/7c9cc5a6e5d38010801741ac830a3f8fd667a7a0' (2023-10-19)