Use ruby-next so that we don't need to specify version (!178688) · Merge requests · GitLab.org / GitLab

What does this MR do and why?

Use ruby-next so that we don't need to specify version

Also use a simple job to pass merge train

References

This is a follow up from: !178525 (comment 2309123553)

Update ruby-sync: This merge request
Update .gitlab-ci.yml: !178687 (merged)

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