flake.lock: Update

Flake lock file updates:

• Updated input 'neovim-nightly':
    'github:neovim/neovim/ac353e87aecf02315d82a3ad22725d2bc8140f0c?dir=contrib' (2023-10-28)
  → 'github:neovim/neovim/64c2c7c40da4bafb6f74076b7ffbffb262246c7a?dir=contrib' (2023-11-15)
• Updated input 'nixpkgs':
    'github:nixos/nixpkgs/808c0d8c53c7ae50f82aca8e7df263225cf235bf' (2023-10-26)
  → 'github:nixos/nixpkgs/911ad1e67f458b6bcf0278fa85e33bb9924fed7e' (2023-11-11)
• Updated input 'pre-commit-hooks':
    'github:cachix/pre-commit-hooks.nix/bd38df3d508dfcdff52cd243d297f218ed2257bf' (2023-10-25)
  → 'github:cachix/pre-commit-hooks.nix/ea758da1a6dcde6dc36db348ed690d09b9864128' (2023-11-06)