flake.lock: Update

Flake lock file updates:

• Updated input 'neovim-nightly':
    'github:nix-community/neovim-nightly-overlay/14d38c816fe5df42e1343734b95321cace5f38b0?narHash=sha256-tpfJHMdtPNxgHtaoTKHxL14aGmoVFjm7vPccWEP2sFY%3D' (2025-02-24)
  → 'github:nix-community/neovim-nightly-overlay/ccadf4fb5be63e92b3559b361a6fb0638b2be71c?narHash=sha256-ssIPmQe/y7SbihUERqGimFwcw1A8lOq2ry9uNw%2BMBiA%3D' (2025-02-26)
• Updated input 'neovim-nightly/neovim-src':
    'github:neovim/neovim/268a3de0a7737155eb5ab1372a9ed76599751847?narHash=sha256-8kzgzIsz4Bj82yLMlpV8uemAgWblWezZaHj2gKOGv9c%3D' (2025-02-23)
  → 'github:neovim/neovim/23f7e5593db2b4c2d6c1a17de8497a653b4826e3?narHash=sha256-tv2PC7nxLNxMuV%2BzR%2B0slfSWKFMWcdSg5/i4knqoQik%3D' (2025-02-25)
• Updated input 'neovim-nightly/nixpkgs':
    'github:NixOS/nixpkgs/dad564433178067be1fbdfcce23b546254b6d641?narHash=sha256-vn285HxnnlHLWnv59Og7muqECNMS33mWLM14soFIv2g%3D' (2025-02-20)
  → 'github:NixOS/nixpkgs/d9b69c3ec2a2e2e971c534065bdd53374bd68b97?narHash=sha256-ATMHHrg3sG1KgpQA5x8I%2BzcYpp5Sf17FaFj/fN%2B8OoQ%3D' (2025-02-24)

Author: github-actions[bot]