Draft: Resolve "PyYAML requirement is buggy for Cython > 3.0"

Summary

Insert a meaningful description for this merge request here: What is the new/changed behavior? Which bug has been fixed? Are there related issues?

Focus

Point the reviewer to the core of the code change. Where should they start reading? What should they focus on (e.g. security, performance, maintainability, user-friendliness, compliance with the specs, finding more corner cases, concrete questions)?

Test Environment

How to set up a test environment for manual testing?

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• All automated tests pass
• Reference related issues
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• Appropriate user and developer documentation (or not necessary)
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• I understand the intent of this MR
• All automated tests pass
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• Appropriate user and developer documentation (or not necessary)
• The test environment setup works and the intended behavior is reproducible in the test environment
• In-code documentation and comments are up-to-date.
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For further good practices have a look at our review guidelines.

Related to #68 (closed)