Fix: Row striping font color contrast with background

[juleswg23]

Summary

See related issue. The color of the text of gt-striped rows does not get contrasted with the striping color.

From talking with Rich, we've revised rgba(128,128,128,0.05) to #F4F4F4 as the default striping color, since we don't need to use transparency.

Related GitHub Issues and PRs

• Ref: Closes bug: Row striping text coloring not contrasted with background. #744

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 91.43%. Comparing base (8e35cc1) to head (472d107).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #745      +/-   ##
==========================================
- Coverage   91.44%   91.43%   -0.01%     
==========================================
  Files          47       47              
  Lines        5551     5547       -4     
==========================================
- Hits         5076     5072       -4     
  Misses        475      475              

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[rich-iannone]

LGTM