flake.lock: Update

Flake lock file updates:

• Updated input 'neovim-nightly':
    'github:neovim/neovim/ac353e87aecf02315d82a3ad22725d2bc8140f0c?dir=contrib' (2023-10-28)
  → 'github:neovim/neovim/5cefec7349610853910c21a0215f85a4d47132d1?dir=contrib' (2023-11-04)
• Updated input 'nixpkgs':
    'github:nixos/nixpkgs/808c0d8c53c7ae50f82aca8e7df263225cf235bf' (2023-10-26)
  → 'github:nixos/nixpkgs/9d5d25bbfe8c0297ebe85324addcb5020ed1a454' (2023-11-04)
• Updated input 'pre-commit-hooks':
    'github:cachix/pre-commit-hooks.nix/bd38df3d508dfcdff52cd243d297f218ed2257bf' (2023-10-25)
  → 'github:cachix/pre-commit-hooks.nix/dec10399e5b56aa95fcd530e0338be72ad6462a0' (2023-11-01)