- Create a new test class `OpenAPI31ReferencesTest` for validating OpenAPI 3.1 references.
- Implement setup method to initialize the router and load OpenAPI specs.
- Update test cases to handle requests for both `/pets` and `/users` endpoints.
- Modify the existing OpenAPI specification to include server information in the YAML configuration.

…ptor

- Import Json31 from Swagger library
- Serialize OpenAPI records to JSON bytes in returnOpenApiAsYaml method
- Update XML configuration to reference OpenAPI specification location

- Modify `OpenAPIPublisherInterceptor` to serialize rewritten OpenAPI record to YAML response.
- Update `OpenAPIRecordFactory` to create `OpenAPIRecord` using parsed `OpenAPI` objects.
- Add `getSpec()` method to convert `OpenAPI` to `JsonNode` for schema retrieval.
- Adjust XML configuration to reference OpenAPI specification files correctly.

…cordFactory