Node 20

I use your great action. Thank you! Now it warns:
> Node.js 16 actions are deprecated. Please update the following actions to use Node.js 20: leafo/gh-actions-lua@v10, leafo/gh-actions-luarocks@v4. For more information see: https://github.blog/changelog/2023-09-22-github-actions-transitioning-from-node-16-to-node-20/.

Kindly update Node 16 to 20.