Change functional job py39 to py310
Based on the runtimes of 2023.1[1], we are modifying the
functional jobs to test against python 3.8 and python 3.10.
[1]
- ^cinder/tests/unit.*$
- ^doc/.*$
- ^releasenotes/.*$
- - openstack-tox-functional-py39:
+ - openstack-tox-functional-py310:
irrelevant-files: *functional-irrelevant-files
- cinder-rally-task:
voting: false
