flake.lock: Update (#570)

Flake lock file updates:

• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/7e7c39ea35c5cdd002cd4588b03a3fb9ece6fad9?narHash=sha256-EYekUHJE2gxeo2pM/zM9Wlqw1Uw2XTJXOSAO79ksc4Y%3D' (2024-07-12)
  → 'github:NixOS/nixpkgs/1d9c2c9b3e71b9ee663d11c5d298727dace8d374?narHash=sha256-8MUgifkJ7lkZs3u99UDZMB4kbOxvMEXQZ31FO3SopZ0%3D' (2024-07-19)
• Updated input 'rust-overlay':
    'github:oxalica/rust-overlay/92f0608ab66c9770e931056b1c7a1b6249dbc43a?narHash=sha256-WMwo/kZ3o2h5Bls4dEyQ3XFZ4nw2UbbOUFpq3aVlkms%3D' (2024-07-13)
  → 'github:oxalica/rust-overlay/b7996075da11a2d441cfbf4e77c2939ce51506fd?narHash=sha256-gYGX9/22tPNeF7dR6bWN5rsrpU4d06GnQNNgZ6ZiXz0%3D' (2024-07-20)

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>
Co-authored-by: Raphael Amorim <rapha850@gmail.com>