Ground work for integration tests with real instance

[erimicel]

Change Summary

Related: https://github.com/typesense/typesense-ruby/issues/42

This PR covers the groundwork for introducing integration/request tests with an actual Docker container;

• Adds Ruby 3.4 to CI Matrix
• Updates dev gems
• Making sure all collection tests using same schema structure
• Allow localhost requests in rspec with WebMock

PR Checklist

• [x] I have read and signed the Contributor License Agreement.