Client bugfix

This release fixes an issue with the client where the OpenAPI Specification was retrieved by URL using the built-in functionality from the Swagger dependency. The client now uses the provided JAX-RS client, as it does for all other HTTP requests. This ensures that the OpenAPI Specification is retrieved according to the configuration provided for the JAX-RS client (which may include things like authentication headers).

This release also includes a minor server-side fix to set the correct media type in the API service document's link to the OpenAPI Specification (which was previously left as null).