---
upgrade:
  - |
    Removes support for any distributions using Python 3.6 since OpenStack no
    longer supports it. This includes:

    * CentOS Stream 8, RHEL 8 and derivatives.
    * OpenSUSE Leap 15 (all minor versions).
    * Debian 10 "Buster".
    * Ubuntu 18.04 "Bionic".