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The motivation for this pull request is just that with python 3.12 a deprecation warning is shown. So the initial idea was just to change the code to avoid the deprecation warning. The other changes just make sense to officially support python 3.12. In the github workflow currently tests are run with 3.12.0-rc.2 because 3.12.0 is not out yet. We could wait until the final release is ready and then merge this.
The specific changes are: