Re-require Python 3.9

[dennis-sig]

As previously discussed. We now give an error message for Python 3.7 and 3.8. This re-enables us actually using Python 3.9.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[github-actions]

Sigrid maintainability feedback

✅ You wrote maintainable code and achieved your objective of 3.5 stars

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Sigrid compared your code against the baseline of 2025-10-22.

👍 What went well?

You fixed or improved 0 refactoring candidates.

👎 What could be better?

You did not introduce any technical debt during your changes, great job!

📚 Remaining technical debt

1 refactoring candidates didn't get better or worse, but are still present in the code you touched.

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⭐️ Sigrid ratings

System property	System on 2025-10-22	Before changes	New/changed code
Volume	5.5	N/A	N/A
Duplication	5.5	5.5	5.5
Unit Size	4.6	5.5	5.5
Unit Complexity	3.8	0.5	0.5
Unit Interfacing	2.3	5.5	5.5
Module Coupling	3.0	N/A	N/A
Component Independence	0.6	N/A	N/A
Component Entanglement	1.7	N/A	N/A
Maintainability	3.6	3.6	3.6

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