flake.lock: Update (#15)

Flake lock file updates:

• Updated input 'flake-utils':
    'github:numtide/flake-utils/f9e7cf818399d17d347f847525c5a5a8032e4e44' (2023-08-23)
  → 'github:numtide/flake-utils/ff7b65b44d01cf9ba6a71320833626af21126384' (2023-09-12)
• Updated input 'nixpkgs':
    'github:nixos/nixpkgs/efd23a1c9ae8c574e2ca923c2b2dc336797f4cc4' (2023-09-06)
  → 'github:nixos/nixpkgs/1697b7d480449b01111e352021f46e5879e47643' (2023-09-13)
• Updated input 'rust-overlay':
    'github:oxalica/rust-overlay/f179280eed5eb93759c94bf3231fbbda28f894b7' (2023-09-04)
  → 'github:oxalica/rust-overlay/7c4f46f0b3597e3c4663285e6794194e55574879' (2023-09-14)

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>