chore: Add Version.dtypes, remove import_dtypes_module

[dangotbanned]

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

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

Related issues

• Direct follow-up to (chore: Add Version.namespace, remove import_namespace #2425)

Checklist

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

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

[dangotbanned]

I could always just revert the pandas changes in (3dd71a1), but I'm quite unsure how it broke plotly and wasn't caught by our tests 🤔

• https://github.com/narwhals-dev/narwhals/actions/runs/14647580216/job/41105540589?pr=2431
• https://github.com/plotly/plotly.py/blob/627c0e94706a02ff19247c19f6fdf8baf8c7ff11/tests/test_optional/test_px/test_px_functions.py#L59-L89
• px.pie raises ColumnNotFoundError when names and category_order is passed at the same time on plotly 6.0.0 plotly/plotly.py#4999
• fix: custom category order was hard-coded plotly/plotly.py#5000

@FBruzzesi @MarcoGorelli - was wondering if you were able to spot anything semantically different?

Ideally so I could add a test that'll warn me when I do that again 😄

Update

No closer to knowing what was wrong, but whatever I introduced is no longer there (6d56dc6)

[FBruzzesi]

Thanks @dangotbanned - Left a tiny comment and maybe some thoughts for your comment

[FBruzzesi]

LGTM Thanks @dangotbanned

[dangotbanned]

LGTM Thanks @dangotbanned

😂