ResponseOutputTextAnnotationAddedEvent annotation property should be a ref to the annotation component

[baywet]

 ResponseOutputTextAnnotationAddedEvent:
      type: object
      title: ResponseOutputTextAnnotationAddedEvent
      description: |
        Emitted when an annotation is added to output text content.
      properties:
        type:
          type: string
          enum:
            - response.output_text.annotation.added
          description: The type of the event. Always 'response.output_text.annotation.added'.
          x-stainless-const: true
        item_id:
          type: string
          description: The unique identifier of the item to which the annotation is being added.
        output_index:
          type: integer
          description: The index of the output item in the response's output array.
        content_index:
          type: integer
          description: The index of the content part within the output item.
        annotation_index:
          type: integer
          description: The index of the annotation within the content part.
        sequence_number:
          type: integer
          description: The sequence number of this event.
        annotation:
-           type: object
+          $ref: "#/components/schemas/Annotation"
          description: The annotation object being added. (See annotation schema for details.)

This will improve the developer experience in the SDKs across all languages. https://github.com/openai/openai-python/blob/f94256daf8f5d7268f28c2330dc343660a959c3e/src/openai/types/responses/response_output_text_annotation_added_event.py#L13