chore(flake.lock): Update ethereum-nix input (2024-11-17)

This makes it use the stable fenix rustc channel.

Flake lock file updates:

• Updated input 'ethereum-nix':
    'github:metacraft-labs/ethereum.nix/cd120903d79a88a6eeabf4a5ed4fa04aa12deca6?narHash=sha256-DE76P4GfCLeGLq%2BpjCE8nRWEW50FCOaxPUwdI4i8hGA%3D' (2024-10-22)
  → 'github:metacraft-labs/ethereum.nix/5e18f9142604e2895539c4b90ffbaa1a890f8602?narHash=sha256-mmEEH/ZWckS11MwjNjAVGxbLJfyM355uQH3wMFihpWA%3D' (2024-11-19)

Author: PetarKirov