Bump RubyGems and bundler versions
This matches the versions we use in GitLab Rails. We should pull in the latest to ensure that the right native gems are selected (https://github.com/rubygems/rubygems/pull/5852).
This matches the versions we use in GitLab Rails. We should pull in the latest to ensure that the right native gems are selected (https://github.com/rubygems/rubygems/pull/5852).