The GitLab CD/CI stages now use the overlay2 driver when employing Docker in Docker for faster builds with less overhead.
The Gunicorn version was updated 20.0.4 to 20.1.0. The Gevent version was updated from 20.4.0 to 21.8.0.
All serializer now specify their read only fields explicitly. This improves serialization speed on large API responses.
Backward incompatible changes