Github action version deprecation error

[Kebap]

With the instructions and version numbers given here:
https://github.com/demonnic/muddler/wiki/CI#on-github

You reach an error message nowadays imploring you to update instead:

Error: This request has been automatically failed because it uses a deprecated version of actions/upload-artifact: v3.1.2.
Learn more: https://github.blog/changelog/2024-04-16-deprecation-notice-v3-of-the-artifact-actions/

Need to update not only wiki but the actions linked there, and maybe other places, too.