[ruby] Update Ruby 3.4.8 → 3.4.9

[depfu]

Here is everything you need to know about this upgrade. Please take a good look at what changed and the test results before merging this pull request.

What changed?

Release Notes

3.4.9

Posted by nagachika on 11 Mar 2026

      <p>Ruby 3.4.9 has been released.</p>

This release includes an update to the zlib gem addressing CVE-2026-27820, along with other bug fixes. Please see the GitHub releases for further details.

We recommend updating your version of the zlib gem. This release has been made for the convenience of those who wish to continue using it as a default gem.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.21%. Comparing base (430e83a) to head (b4df076).
⚠️ Report is 2 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #5627      +/-   ##
===========================================
- Coverage    87.24%   87.21%   -0.03%     
===========================================
  Files         1461     1461              
  Lines        33003    33003              
  Branches      3470     3470              
===========================================
- Hits         28792    28783       -9     
- Misses        4190     4199       +9     
  Partials        21       21              

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