flake.lock: Update (#434)

Flake lock file updates:

• Updated input 'neovim-nightly':
    'github:nix-community/neovim-nightly-overlay/dcd1be4d5f9fa160d0c68c1967f4ecc458b01969?narHash=sha256-Xp/rWqO4XXJAqh5c2xju4NCBRpi8lQIknLQmCYfrdWY%3D' (2024-12-10)
  → 'github:nix-community/neovim-nightly-overlay/2025aef04baf723bfa4cb8225fc11a319a5681f1?narHash=sha256-djpjqhPZkqfe1USsuu%2BeT4ZyGO%2BdVvAf3l4FUCZEb6Y%3D' (2024-12-12)
• Updated input 'neovim-nightly/neovim-src':
    'github:neovim/neovim/3bb2d027597107a3d7f84ef61507104fd4dc050a?narHash=sha256-Xtd0YLx6RKJMDu2GfE9geO48Dw3KnpVkfZjUqA51xDw%3D' (2024-12-09)
  → 'github:neovim/neovim/442d338cb50e4cf08c58cb82b6d33b6d5df9fb1b?narHash=sha256-Fxzl754uzyNebXW54LUliFliMbw30XG%2Bbdb0AVtPSM0%3D' (2024-12-11)
• Updated input 'neovim-nightly/nixpkgs':
    'github:NixOS/nixpkgs/93dc9803a1ee435e590b02cde9589038d5cc3a4e?narHash=sha256-w0FXPfpGhOihoJDiwMsyN1EzpsXi2F8VQ%2BNVZQSMtys%3D' (2024-12-08)
  → 'github:NixOS/nixpkgs/bc27f0fde01ce4e1bfec1ab122d72b7380278e68?narHash=sha256-%2B5qdtgXceqhK5ZR1YbP1fAUsweBIrhL38726oIEAtDs%3D' (2024-12-09)

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