flake.lock: Update (#499)

Flake lock file updates:

• Updated input 'neovim-nightly':
    'github:nix-community/neovim-nightly-overlay/5ba4ec1627a1a98607779d857d5f8782f158b11c?narHash=sha256-kvgcTSfZ8wOBToSkUDUUc9Tcvdj8GJVJEbcYdCYv93U%3D' (2025-02-19)
  → 'github:nix-community/neovim-nightly-overlay/6d35f4af8befccf1764401509b320c117b043570?narHash=sha256-m7w1Cpi9FqeFkTiwJT4/2oEOd08jHyftGZH4JQNFwlY%3D' (2025-02-21)
• Updated input 'neovim-nightly/neovim-src':
    'github:neovim/neovim/9005134cdc8e578201b90192253171a9bc261752?narHash=sha256-q8hkuuK/pzHvoKMHrXvlgqIWdXfv0PMyXzC8Vwh0ZG8%3D' (2025-02-19)
  → 'github:neovim/neovim/1fb606b2ff68b42f77aad6f9a6e00c37e1b2aab0?narHash=sha256-B%2B4iJ5It0sgV1oNsHTJtna38J%2B1RkXHbsJylPlDHBuY%3D' (2025-02-20)
• Updated input 'neovim-nightly/nixpkgs':
    'github:NixOS/nixpkgs/632f04521e847173c54fa72973ec6c39a371211c?narHash=sha256-UbtgxplOhFcyjBcNbTVO8%2BHUHAl/WXFDOb6LvqShiZo%3D' (2025-02-18)
  → 'github:NixOS/nixpkgs/dad564433178067be1fbdfcce23b546254b6d641?narHash=sha256-vn285HxnnlHLWnv59Og7muqECNMS33mWLM14soFIv2g%3D' (2025-02-20)
• Updated input 'nixpkgs':
    'github:nixos/nixpkgs/632f04521e847173c54fa72973ec6c39a371211c?narHash=sha256-UbtgxplOhFcyjBcNbTVO8%2BHUHAl/WXFDOb6LvqShiZo%3D' (2025-02-18)
  → 'github:nixos/nixpkgs/dad564433178067be1fbdfcce23b546254b6d641?narHash=sha256-vn285HxnnlHLWnv59Og7muqECNMS33mWLM14soFIv2g%3D' (2025-02-20)

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

Author: mrcjkb