chore(flake): update lock - #28

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v4, cachix/cachix-action@v15. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

Unexpected input(s) 'extraPullNames', valid inputs are ['extra_nix_config', 'github_access_token', 'install_url', 'install_options', 'nix_path', 'enable_kvm', 'set_as_trusted_user']