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Add Ruby 3.1 to Circle tests

Merged Jordan Brough requested to merge github/fork/jordan-brough/test-ruby-3.1 into main

This PR builds on #2127 and #2128 to add test coverage for Ruby 3.1. i.e.: Ignore the first 2 commits in this PR. (update: Those PRs were merged and I've rebased this)

A couple things:

  • Remove usage of YAML aliases in the test example_app to work around a Psych 4 incompatibility with Rails 6. (See the commit message on that commit for more details).
  • Add Circle configs for testing Ruby 3.1, and limit it to testing Rails 6.1. I don't think Rails 6.0 is compatible with Ruby 3.1 (e.g. see here) and I was seeing some test failures that seemed to confirm that, iirc. When Rails 7 test coverage is added then Ruby 3.1 can cover that as well of course.
  • This uses CircleCI's new cimg/ruby docker image, which replaces the old circleci/ruby docker image, because the Ruby 3.1 hasn't been added to the latter and it sounds like it won't be. We could probably update everything to cimg/ruby if we want. Or we could test it out a bit on Ruby 3.1 for a while first.

Does that all seem reasonable?