ci: fix test xml result generate

[NguyenHoangSon96]

Closes #

Proposed Changes

• Switches the JRuby jobs from jruby:9.3.1.0-jdk11 to jruby:9.4-dev-jdk11.
• Adds a conditional step to install git only when using the jruby:9.4-dev-jdk11 Docker image.
• Ensures perl is installed before running the Codecov uploader verification steps (the workflow uses shasum, which depends on perl on Debian/Ubuntu images).
• Adds a monkeypatch for REXML::Document#initialize to tolerate malformed XML emitted during Cobertura report formatting.

Checklist

• CHANGELOG.md updated
• Rebased/mergeable
• A test has been added if appropriate
• rake test completes successfully
• Commit messages are conventional
• Sign CLA (if not already signed)

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 48.18%. Comparing base (1bc4c39) to head (b0a9e3d).
⚠️ Report is 1 commits behind head on master.
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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #152      +/-   ##
==========================================
- Coverage   48.23%   48.18%   -0.05%     
==========================================
  Files          77       77              
  Lines        7948     7923      -25     
==========================================
- Hits         3834     3818      -16     
+ Misses       4114     4105       -9     

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[bednar]

LGTM 🚀