[Daily][Ruby] Update RubyGems Dependencies

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1. Overview

This pull request was created automatically by the Ruby - Daily Dependencies Update workflow.
It upgrades RubyGems and Bundler, updates every gem to the latest version allowed by the Gemfile, mirrors the updated versions to the Gemfile, and re-locks Gemfile.lock so its DEPENDENCIES section stays in sync with the Gemfile:

gem update --system
gem install bundler
bundle update --bundler
bundle update --all

2. Key Changes & Differences

Gems	Before	After	Changes & Differences
concurrent-ruby	1.3.7	1.3.8	Patch-level update. Modern concurrency tools including agents, futures, promises, thread pools, actors, supervisors, and more. Transitive dependency.

3. Summary

All gem dependencies in ruby/Gemfile and ruby/Gemfile.lock are now up to date.
Please make sure that all CI workflows pass before merging this pull request.

4. References

• Ruby - Daily Dependencies Update workflow run
• bundle update documentation
• RubyGems

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