convenience: add pyarrow to polars install

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📝 Summary

If you don't install pyarrow, Marimo will throw a ModuleNotFoundError and ask you to install pyarrow.

Fix is to follow this guide: https://duckdb.org/docs/guides/python/polars.html

Not sure if we can update the versioning of the packages.

🔍 Description of Changes

📋 Checklist

• I have read the contributor guidelines.
• For large changes, or changes that affect the public API: this change was discussed or approved through an issue, on Discord, or the community discussions (Please provide a link if applicable).
• I have added tests for the changes made.
• I have run the code and verified that it works as expected.

📜 Reviewers

@akshayka OR @mscolnick

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[mscolnick]

Ah thanks for this change. This is correct.