nix: update flake.lock

Flake lock file updates:

• Updated input 'agenix':
    'github:ryantm/agenix/db5637d10f797bb251b94ef9040b237f4702cde3' (2023-05-15)
  → 'github:ryantm/agenix/0d8c5325fc81daf00532e3e26c6752f7bcde1143' (2023-07-14)
• Updated input 'darwin':
    'github:LnL7/nix-darwin/eb22022ba8faeeb7a9be8afe925511b88ad12ca5' (2023-07-11)
  → 'github:LnL7/nix-darwin/c806a73609e77f0c446fdad5d3ea6ca3b7ae6e5f' (2023-07-13)
• Updated input 'home-manager':
    'github:nix-community/home-manager/a6d1d954b81caf4c9291b8ac35452fef842f289b' (2023-07-10)
  → 'github:nix-community/home-manager/c1cdce3d89741d402d8fd2c93e3d2643ff85b053' (2023-07-14)
• Updated input 'nixos-hardware':
    'github:NixOS/nixos-hardware/44bc025007e5fcc10dbc3d9f96dcbf06fc0e8c1c' (2023-07-11)
  → 'github:NixOS/nixos-hardware/d4ea64f2063820120c05f6ba93ee02e6d4671d6b' (2023-07-14)
• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/4a729ce4b1fe5ec4fffc71c67c96aa5184ebb462' (2023-07-10)
  → 'github:NixOS/nixpkgs/e74e68449c385db82de3170288a28cd0f608544f' (2023-07-13)
• Updated input 'treefmt-nix':
    'github:numtide/treefmt-nix/3c54278bf7b8642eba174a22ca02d5552c21dc0b' (2023-07-11)
  → 'github:numtide/treefmt-nix/f1dca68b908f3dd656b923b9fb62f7d755133662' (2023-07-13)