Bump next Ruby version to 3.4.10 in CI

Stan Hurequested to merge
sh-test-ruby-3-4-ci into master

What does this MR do and why?

Bumps RUBY_VERSION_NEXT to 3.4.10 so that merge request pipelines exercise GitLab against Ruby 3.4, while the default Ruby version (RUBY_VERSION_DEFAULT) stays at 3.3.12. The next-ruby Omnibus cache edition is also pointed at GITLAB_RUBY3_4.

All tests should now pass under Ruby 3.4 across the Rails, Omnibus, and CNG pipelines.

References

Edited by Stan Hu

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