[Enhancement]: Update Action to Node.js v20 to remove GitHub deprecation warning

[maxkratz]

What changes would you like?

As far as I understand, this GitHub Action still uses Node.js v16, which is deprecated according to GitHub's blog: https://github.blog/changelog/2023-09-22-github-actions-transitioning-from-node-16-to-node-20/

I suggest updating this GitHub Action to Node.js v20 and releasing a new version (e.g., v2.0.0) to fix the warning.

Any extra information?

The warning can be seen, e.g., here: https://github.com/VSCodium/vscodium/actions/runs/8253791641