[Rails5] Update Gemfile.rails5.lock

What does this MR do?

Updates the Gemfile.rails5.lock file by the BUNDLE_GEMFILE=Gemfile.rails5 bundle install command.

The EE MR is https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/5967

Why was this MR needed?

To keep gems synchronized both for rails4 and rails5.

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• API support added
• Tests added for this feature/bug
• Conform by the code review guidelines
  • Has been reviewed by a UX Designer
  • Has been reviewed by a Frontend maintainer
  • Has been reviewed by a Backend maintainer
  • Has been reviewed by a Database specialist
• Conform by the merge request performance guides
• Conform by the style guides
• If you have multiple commits, please combine them into a few logically organized commits by squashing them
• Internationalization required/considered
• End-to-end tests pass (package-and-qa manual pipeline job)