flake.lock: Update

Flake lock file updates:

• Updated input 'flake-utils':
    'github:numtide/flake-utils/4022d587cbbfd70fe950c1e2083a02621806a725' (2023-12-04)
  → 'github:numtide/flake-utils/1ef2e671c3b0c19053962c07dbda38332dcebf26' (2024-01-15)
• Updated input 'gomod2nix':
    'github:tweag/gomod2nix/001bbfa22e2adeb87c34c6015e5694e88721cabe' (2023-12-04)
  → 'github:tweag/gomod2nix/30e3c3a9ec4ac8453282ca7f67fca9e1da12c3e6' (2024-01-15)
• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/bd645e8668ec6612439a9ee7e71f7eac4099d4f6' (2024-01-02)
  → 'github:NixOS/nixpkgs/842d9d80cfd4560648c785f8a4e6f3b096790e19' (2024-01-17)