test: fix docstrings tests in CI

[raisadz]

What type of PR is this? (check all applicable)

• [ ] 💾 Refactor
• [ ] ✨ Feature
• [ ] 🐛 Bug Fix
• [ ] 🔧 Optimization
• [ ] 📝 Documentation
• [x] ✅ Test
• [ ] 🐳 Other

Related issues

• Related issue #
• Closes #

Checklist

• [x] Code follows style guide (ruff)
• [ ] Tests added
• [ ] Documented the changes

If you have comments or can explain your changes, please do so below.

The docstring tests didn't run in CI. The Python version for testing docstrings is changed to 3.13 whereas for ibis tests it is changed to 3.11. The outputs are fixed.