Add support ruby 3.3, 3.4

[hatsu38]

Summary

This PR adds support for Ruby 3.3 and 3.4 to the test suite.

#1667

Changes

• Add Ruby 3.3 and 3.4 to the CI test matrix
• Add test combinations for Ruby 3.3/3.4 with Rails 7.0 (ActiveRecord)
• Add test combinations for Ruby 3.3/3.4 with Rails 7.0 + Mongoid 7
• Exclude incompatible Rails versions (4.2, 5.x, 6.0) from Ruby 3.3/3.4 tests

What this PR does NOT include

To keep this PR focused and reviewable, the following changes are intentionally not included and will be addressed in separate PRs:

• ❌ Dropping support for older Ruby versions (2.7, 3.0, 3.1)
• ❌ Dropping support for EOL Rails versions (< 7.2)
• ❌ Adding support for Rails 7.2, 8.0, 8.1

Testing

CI will verify that all tests pass with Ruby 3.3 and 3.4 on:

• Rails 7.0 with SQLite, MySQL, and PostgreSQL
• Rails 7.0 with Mongoid 7

Related

This is the first step toward modernizing our supported Ruby/Rails versions. Follow-up PRs will:

1. Add Rails 8.0 support
2. Add Rails 8.1 support
3. Remove EOL versions

[MaicolBen]

Thank you!!

❌ Dropping support for older Ruby versions (2.7, 3.0, 3.1)

Not sure about 3 versions

❌ Adding support for Rails 7.2, 8.0, 8.1

I suffered trying this (you can check my closed PRs) but you might be lucky