Switch centos 9-stream jobs to run with python 3.11

With [1] py39 constraints drop can't run fips jobs on
centos 9-stream or rocky9.
As a workaround we can run with PYTHON3_VERSION: 3.11 in affected
jobs until centos 10-stream support is ready[1]

[1] https://review.opendev.org/c/openstack/requirements/+/948285
[2] https://review.opendev.org/c/openstack/devstack/+/937251

Closes-Bug: #2110744
Change-Id: I4e5bd3f643aec78b27b586de33e41871ff54539c
1 file changed