Stop testing against Ruby 2.7 and start testing against Ruby 3.2

What does this merge request do and why?

Based on: gitlab-org/ruby/gems/gitlab_kramdown!84 (comment 1251789670), we'll be looking to Ruby 3.2 in the not too distant future, so we can begin to tackle low-hanging fruit now.

This runs GDK tests against Ruby 3.2, and stops running tests against Ruby 2.7.7.

CC @mkaeppler

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Merge request checklist

  • This change is backward compatible. If not, please include steps to communicate to our users.
  • Tests added for new functionality. If not, please raise an issue to follow-up.
  • Documentation added/updated, if needed.
  • Announcement added, if change is notable.
  • gdk doctor test added, if needed.
  • Add the ~highlight label if this MR should be included in the CHANGELOG.md.

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