flake.lock: Update

Flake lock file updates:

• Updated input 'neovim-nightly':
    'github:neovim/neovim/367e52cc79a786bbee4456b30f9ec5db7e28d6a5?dir=contrib' (2024-01-07)
  → 'github:neovim/neovim/ee3d4f6b90d0902aa17936d1f0944755516569a1?dir=contrib' (2024-01-08)
• Updated input 'nixpkgs':
    'github:nixos/nixpkgs/63143ac2c9186be6d9da6035fa22620018c85932' (2024-01-02)
  → 'github:nixos/nixpkgs/24fe8bb4f552ad3926274d29e083b79d84707da6' (2024-01-07)
• Updated input 'pre-commit-hooks':
    'github:cachix/pre-commit-hooks.nix/44493e2b3c3ebcd39a9947e9ed9f2c2af164ec4c' (2024-01-07)
  → 'github:cachix/pre-commit-hooks.nix/ea96f0c05924341c551a797aaba8126334c505d2' (2024-01-08)