flake.lock: Update

Flake lock file updates:

• Updated input 'neovim-nightly':
    'github:nix-community/neovim-nightly-overlay/2a9b9e821c7f91eb6ae540925a453f9ebacd0513?narHash=sha256-v17KxlCf0O7hoD9AjiF94T2nuZuh7ZREyI6Ww/Tr4R0%3D' (2024-11-19)
  → 'github:nix-community/neovim-nightly-overlay/821bffa8eb34619dc620d1817c1eb5848bd7bfb0?narHash=sha256-LyTu9sVVZvjTPqDJUuK0Eocwe7j7fbUGNFv1psGvr64%3D' (2024-11-20)
• Updated input 'neovim-nightly/git-hooks':
    'github:cachix/git-hooks.nix/cd1af27aa85026ac759d5d3fccf650abe7e1bbf0?narHash=sha256-vFta1uHnD29VUY4HJOO/D6p6rxyObnf%2BInnSMT4jlMU%3D' (2024-11-11)
  → 'github:cachix/git-hooks.nix/3308484d1a443fc5bc92012435d79e80458fe43c?narHash=sha256-mnTbjpdqF0luOkou8ZFi2asa1N3AA2CchR/RqCNmsGE%3D' (2024-11-19)
• Updated input 'neovim-nightly/neovim-src':
    'github:neovim/neovim/989a37a594649528f28432388c0e7e28e8be2753?narHash=sha256-ZXZInL8J38JaVpglSPa78ptn1zlqbaRHDtpa73CqpfI%3D' (2024-11-18)
  → 'github:neovim/neovim/081beb3659bd6d8efc3e977a160b1e72becbd8a2?narHash=sha256-LrIFdofuhyq/DuIpHbFB2hWRs0maVbw3V662%2B6ZIOeM%3D' (2024-11-19)