flake.lock: Update (#498)

Flake lock file updates:

• Updated input 'neovim-nightly':
    'github:nix-community/neovim-nightly-overlay/f046c69f77caeacd34162729fd5690028a10de20?narHash=sha256-/Qgb9KgID%2Bkir3c3tghst6WylWDG6SuxZPKUtU%2BQAFg%3D' (2025-02-18)
  → 'github:nix-community/neovim-nightly-overlay/5ba4ec1627a1a98607779d857d5f8782f158b11c?narHash=sha256-kvgcTSfZ8wOBToSkUDUUc9Tcvdj8GJVJEbcYdCYv93U%3D' (2025-02-19)
• Updated input 'neovim-nightly/neovim-src':
    'github:neovim/neovim/4a2a54f993e8e3c2b4dfd687386847207033b631?narHash=sha256-wRLPbyVl44xdJxxi9/yY7qouHcB0qB9EsHPQ6PEvLAs%3D' (2025-02-17)
  → 'github:neovim/neovim/9005134cdc8e578201b90192253171a9bc261752?narHash=sha256-q8hkuuK/pzHvoKMHrXvlgqIWdXfv0PMyXzC8Vwh0ZG8%3D' (2025-02-19)
• Updated input 'neovim-nightly/nixpkgs':
    'github:NixOS/nixpkgs/f0204ef4baa3b6317dee1c84ddeffbd293638836?narHash=sha256-oAgAV4fLWMIPqsEyZVVdk7c0SUdDOV1E7Epq0EIUQs4%3D' (2025-02-16)
  → 'github:NixOS/nixpkgs/632f04521e847173c54fa72973ec6c39a371211c?narHash=sha256-UbtgxplOhFcyjBcNbTVO8%2BHUHAl/WXFDOb6LvqShiZo%3D' (2025-02-18)

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

Author: mrcjkb