- Test against latest stable Ruby versions
- Test against AR 7.1 and 7.2
- Sort by AR version descending
- Do not test incompatible Ruby / AR versions (ex: Ruby 3.0 / AR 5.x)
- Use `include` syntax for legacy AR versions
- Mark `edge` tests as `experimental` to allow failures
- Update checkout actions
- Add explicit permissions for improved security
- Fix test warning related to keyword argument in Struct#initialize

Ref: https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#permissions

As per EOL policies, remove support for:
- Ruby < 3.1
- Rails < 7.0

Also:
- Remove RGeo < 3 support
- Test against jruby 9.4.8 and jruby-head