Prepare for 3.0

[jankapunkt]

Is your feature request related to a problem? Please describe.

This is a feature request - we should make this repo 3.0-ready so all new packages will be, too

Describe the solution you'd like

In order to easily create new 3.0-compatible packages we should make this repo 3.0 ready first

Describe alternatives you've considered

There is no alternative

Additional context

[github-actions]

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