Fix deprecation warning in as_raw_html for Python 3.13

[stinodego]

Summary

At Polars we have an integration with great-tables. We are adding Python 3.13 support and noticed a DeprecationWarning coming from great-tables in our test suite. Looks like it comes from the as_raw_html method, which uses re.sub but with positional arguments for count and flags, which is deprecated in Python 3.13.

This was a simple fix, so I figured I'd just open a PR. Let me know if you need more context/input.

Checklist

• I understand and agree to the Code of Conduct.
• I have followed the Style Guide for Python Code as best as possible for the submitted code.
• I have added pytest unit tests for any new functionality.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.67%. Comparing base (4043f14) to head (8f1b188).
Report is 5 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #563   +/-   ##
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  Coverage   90.67%   90.67%           
=======================================
  Files          46       46           
  Lines        5381     5381           
=======================================
  Hits         4879     4879           
  Misses        502      502           

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[machow]

This LGTM--thanks! @rich-iannone do you want to merge?

[rich-iannone]

LGTM!