flake.lock: Update (#412)

Flake lock file updates:

• Updated input 'neovim-nightly':
    'github:nix-community/neovim-nightly-overlay/81a983160c1acae623482e082a94a46c931d0261?narHash=sha256-rCTdc6oHM4Ostt6IR66QiDrPQNjCsxC2r00GfU0bADU%3D' (2024-11-15)
  → 'github:nix-community/neovim-nightly-overlay/973f6526dd30053a7ef98017272207af00bd615b?narHash=sha256-RJ9xa3O8LCyw90BT2HooAmBiXns20%2B2ocLd1GDO54qg%3D' (2024-11-16)
• Updated input 'neovim-nightly/neovim-src':
    'github:neovim/neovim/05d354e2165c2c331a33949d49095eef3503a32f?narHash=sha256-EjIQ7ok02IfDHDMKdKELuvFRHlZhzhymDGGx3jg6nvQ%3D' (2024-11-14)
  → 'github:neovim/neovim/6e4df18b457e9743c34068fd6e0a89fd04d3526c?narHash=sha256-TUrqqpotTHgRpsocfXrT0QRJwJCT2xB7rHS0k1U1E0w%3D' (2024-11-15)
• Updated input 'nixpkgs':
    'github:nixos/nixpkgs/24f0d4acd634792badd6470134c387a3b039dace?narHash=sha256-sz8/v17enkYmfpgeeuyzniGJU0QQBfmAjlemAUYhfy8%3D' (2024-11-13)
  → 'github:nixos/nixpkgs/c69a9bffbecde46b4b939465422ddc59493d3e4d?narHash=sha256-ddcX4lQL0X05AYkrkV2LMFgGdRvgap7Ho8kgon3iWZk%3D' (2024-11-16)

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