Updated pinned upper-constraints for Python 3.9

Preparing to moving cs9 based jobs to non voting

Also moving keystone cs9 jobs to non-voting as keystone
dropped support for Python 3.9

Change-Id: I872aa87ff030b0dcf0f7b4031fd228819ad1ee62
Signed-off-by: Riccardo Pittau <[email protected]>

Author: elfosardo