Upgrade Node.js to version 20

[Seb33300]

Our workflow is triggering this warning:

Node.js 16 actions are deprecated. Please update the following actions to use Node.js 20: deployphp/action@v1. For more information see: https://github.blog/changelog/2023-09-22-github-actions-transitioning-from-node-16-to-node-20/.

[nilsingwersen]

It's already fixed in 373ff33 Just not released yet. You could use it like mentioned in the comment for now:
uses: deployphp/action@master instead of deployphp/action@v1

[madurapa]

Please release the fix.

[DannyvdSluijs]

This actually was done 5 days ago, see https://github.com/deployphp/action/releases