Kazunori Kimura 3c0be758cb Add ENV RUBYGEMS_VERSION and set to latest 3.5.x
that is GitLab v17.0 recommendation

MR that updates docs/install/installation.md:
- "Bump version of rubygems in installation instructions"
  https://gitlab.com/gitlab-org/gitlab/-/merge_requests/149976

There is no entry in .tools-version
2024-06-21 23:30:34 +09:00
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