flake.lock: Update

Flake lock file updates:

• Updated input 'neovim-nightly':
    'github:nix-community/neovim-nightly-overlay/7461a0b228bb48bb02af086f8b9ee9a83583120b?narHash=sha256-MjqyzOEa6s9OGO8SMh5C2kqo57%2BiSNsgDbzPBbpi4QU%3D' (2024-11-30)
  → 'github:nix-community/neovim-nightly-overlay/0d545972c93c044bed52c27cc4035054793d913a?narHash=sha256-uA/KX/TVlreFS/xZjjAPBoRzybQQWUX%2BUr5mOzsF7FE%3D' (2024-12-01)
• Updated input 'neovim-nightly/neovim-src':
    'github:neovim/neovim/2833925cfc688786759d6a980a1ad62b62d20570?narHash=sha256-JF8zmoLdqmbKCSS5Smf/Yj0jEl5f%2BqKhSubhPo/BvUM%3D' (2024-11-29)
  → 'github:neovim/neovim/ab9cfc4dc3422af5235759efef456d3e02745217?narHash=sha256-VKk53/3aTk91s1OmSfUt6RqFpxBjUy8ZYoYrechTUns%3D' (2024-11-30)
• Updated input 'neovim-nightly/nixpkgs':
    'github:NixOS/nixpkgs/af51545ec9a44eadf3fe3547610a5cdd882bc34e?narHash=sha256-PYkz6U0bSEaEB1al7O1XsqVNeSNS%2Bs3NVclJw7YC43w%3D' (2024-11-26)
  → 'github:NixOS/nixpkgs/4703b8d2c708e13a8cab03d865f90973536dcdf5?narHash=sha256-B5pYT%2BIVaqcrfOekkwKvx/iToDnuQWzc2oyDxzzBDc4%3D' (2024-11-30)
• Updated input 'nixpkgs':
    'github:nixos/nixpkgs/226216574ada4c3ecefcbbec41f39ce4655f78ef?narHash=sha256-NskLIz0ue4Uqbza%2B1%2B8UGHuPVr8DrUiLfZu5VS4VQxw%3D' (2024-11-28)
  → 'github:nixos/nixpkgs/4703b8d2c708e13a8cab03d865f90973536dcdf5?narHash=sha256-B5pYT%2BIVaqcrfOekkwKvx/iToDnuQWzc2oyDxzzBDc4%3D' (2024-11-30)