flake.lock: Update

Flake lock file updates:

• Updated input 'neovim-nightly':
    'github:nix-community/neovim-nightly-overlay/e22b81280db26159447ea54ea06ea6d20435999a?narHash=sha256-1rpSNc0RuUSzy/p%2BFSrKscnzkki9OY8fKJCOe7z8fDA%3D' (2025-01-12)
  → 'github:nix-community/neovim-nightly-overlay/9e2c41b7c12adc3ca17b1b50589f5234bcc0bbac?narHash=sha256-qSbPnZ2utGL39UD6lKi%2BK/7sWyZVl/kGZfOoy%2BxJEjA%3D' (2025-01-13)
• Updated input 'neovim-nightly/neovim-src':
    'github:neovim/neovim/88dca6a83593a0cf33866addf36cad2e847a2899?narHash=sha256-ezIZc9Y1m5ERCpVpl2Dx8DMEgTDe0eVU7Q5eXa0fMw8%3D' (2025-01-11)
  → 'github:neovim/neovim/2c16c849986794682a4776ff4ec100d00eeba5ca?narHash=sha256-sFD18EfXyQrN51ru6uzCt20C3DT4qBipJ1PbP9hnw80%3D' (2025-01-13)
• Updated input 'neovim-nightly/nixpkgs':
    'github:NixOS/nixpkgs/32af3611f6f05655ca166a0b1f47b57c762b5192?narHash=sha256-dMGNa5UwdtowEqQac%2BDr0d2tFO/60ckVgdhZU9q2E2o%3D' (2025-01-09)
  → 'github:NixOS/nixpkgs/2f9e2f85cb14a46410a1399aa9ea7ecf433e422e?narHash=sha256-FWlPMUzp0lkQBdhKlPqtQdqmp%2B/C%2B1MBiEytaYfrCTY%3D' (2025-01-12)
• Updated input 'nixpkgs':
    'github:nixos/nixpkgs/2f9e2f85cb14a46410a1399aa9ea7ecf433e422e?narHash=sha256-FWlPMUzp0lkQBdhKlPqtQdqmp%2B/C%2B1MBiEytaYfrCTY%3D' (2025-01-12)
  → 'github:nixos/nixpkgs/ef56e777fedaa4da8c66a150081523c5de1e0171?narHash=sha256-a3MMEY7i/wdF0gb7WFNTn6onzaiMOvwj7OerRVenA8o%3D' (2025-01-13)