[RLlib][Tune] Build Ray-ML docker image for Python 3.9 #16599
Description
What is the problem?
Currently building Ray docker image with Python 3.9 times out, because some of the direct and transitive dependencies pinned in python/requirements/rllib/requirements_rllib.txt and python/requirements/tune/requirements_tune.txt do not support Python 3.9, and the pip dependency resolver goes into an edge case.
Ray version and other system information (Python version, TensorFlow version, OS):
Python 3.9, Ray 1.4.1