flake.lock: Update

Flake lock file updates:

• Updated input 'nixpkgs-darwin-25-05':
    'github:NixOS/nixpkgs/cacb0bf08c2f851ec166ec665c777cf9fc542283?narHash=sha256-AetDmsj6lkwyEzAhnayQ8wXKkHremjCDqchKhSoAMhE%3D' (2025-10-03)
  → 'github:NixOS/nixpkgs/a74efe3a572a5521c8066b555a1f91dc97fbc69e?narHash=sha256-md4QP3lnqo1jNuMI2XHrTEoqZgWG8B4z2nWF3kkRr9Q%3D' (2025-10-03)
• Updated input 'nixpkgs-unstable':
    'github:NixOS/nixpkgs/dc704e6102e76aad573f63b74c742cd96f8f1e6c?narHash=sha256-O7eHcgkQXJNygY6AypkF9tFhsoDQjpNEojw3eFs73Ow%3D' (2025-10-02)
  → 'github:NixOS/nixpkgs/27ac93958969b5f3dccd654b402599cf3de633ac?narHash=sha256-hhM8SUI6kQMei5TImFdNQy9EDT8g2hAD161DUtbfAy0%3D' (2025-10-04)
• Updated input 'nixvim':
    'github:nix-community/nixvim/71708a77de0568b09a870f8a8c9d700261c31477?narHash=sha256-wmHmXfOzJvGjkRUG7lYt4gdyJ6oYHlSwJekUaMQCqV4%3D' (2025-10-04)
  → 'github:nix-community/nixvim/2f8fbcdfd02b16e7392f5cfa3600aa77cd559d37?narHash=sha256-4j73b%2Bt3B5sN1JAcwAT9XD4P38o3qvBqCkfXPvnAY3o%3D' (2025-10-04)

Author: github-actions[bot]