
As per victoria cycle testing runtime and community goal[1] we need to migrate upstream CI/CD to Ubuntu Focal(20.04). -Bump the requirements and lower constraints for required deps which added python3.8 support in their later version. -It also fixes one unit tests to handle PEP479 being enabled for all code in Python 3.8 [2]. Story: #2007865 Task: #40197 [1] https://governance.openstack.org/tc/goals/selected/victoria/migrate-ci-cd-jobs-to-ubuntu-focal.html [2] https://stackoverflow.com/questions/51700960/runtimeerror-generator-raised-stopiteration-every-time-i-try-to-run-app Change-Id: If67bbfe8a2db19fa8f3437f746ca7f4d04487447