update to node.js 20

[uli-f]

Hi,

first of all: Thanks a lot for this action, I have it running in quite a few of my repos.

When using the action GitHub warns me that Node.js 16 action are deprecated and an update to Node.js 20 is required:

Node.js 16 actions are deprecated. Please update the following actions to use Node.js 20: evryfs/[email protected]. For more information see: https://github.blog/changelog/2023-09-22-github-actions-transitioning-from-node-16-to-node-20/.