2023.2 only: Switch to non-versioned template

... to use the appropriate python versions in tests. This also marks
python 3.10 supported because it's part of the tested runtimes for
2023.2.

The job template was updated in master by [1] so this is submitted as
a stable only change.

[1] https://review.opendev.org/c/openstack/automaton/+/905368

Change-Id: Ib513af50ea3bf77e8edbac7d69b227386b318613

.zuul.yaml

@@ -2,7 +2,7 @@
     templates:
       - check-requirements
       - lib-forward-testing-python3
-      - openstack-python3-antelope-jobs
+      - openstack-python3-jobs
       - periodic-stable-jobs
       - publish-openstack-docs-pti
       - release-notes-jobs-python3

setup.cfg

@@ -15,6 +15,7 @@ classifier =
     Programming Language :: Python :: 3
     Programming Language :: Python :: 3.8
     Programming Language :: Python :: 3.9
+    Programming Language :: Python :: 3.10
     Programming Language :: Python :: 3 :: Only
     Programming Language :: Python :: Implementation :: CPython
     Topic :: Software Development :: Libraries