Update workflow Ruby versions and deploy action

[l5yth]

Summary

• update CI ruby matrix to test against Ruby 3.4 and 4.0
• bump GitHub Pages deploy action to v4.7.6

Testing

• rufo .
• black .

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Codex Task

[chatgpt-codex-connector]

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Reviewed commit: bb26c2f089

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.22%. Comparing base (ab96917) to head (b44efd8).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #397      +/-   ##
==========================================
- Coverage   99.22%   99.22%   -0.01%     
==========================================
  Files          91       91              
  Lines        6831     6829       -2     
==========================================
- Hits         6778     6776       -2     
  Misses         53       53              

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