Remove Ruby 2.7.7 as a dependency

What does this merge request do and why?

With gitlab-docs!3487 (merged) merged, we no longer need to require Ruby 2.7.7 as a dependency in GDK.

Contributes to: gitlab-docs#1375 (closed).

Impacted categories

The following categories relate to this merge request:

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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