[kolla-ansible] How to pin pip3 module in kolla-ansible

Folks,

I have deployed kolla-ansible using public images so far everything is good until I hit this bug [1] requests pip module had a minor bug.

Now my question is if I want to pin requests==2.31.0 version in kolla-ansible then what file should I be adding to the pin version? This is not an image building related module because it deployed on a metal host so nothing to do with building kolla images. It's a pure docker issue.

1. https://github.com/docker/docker-py/pull/3257