Airflow API Version is binded with Airflow Version?

I have a question. Is there any reason for the last stable API be present only in Airflow > 2.4.0. At this moment, the last airflow version in Google Cloud Composer is 2.3.4, and I the API version does not allow dag_run_id field in body request for clearInstances endpoint. Can I update API separtedly or API Version is binded with Airflow versions? Thank You!