Switch testing to Antelope testing runtime

Updating the testing template to Antelope testing runtime:
https://governance.openstack.org/tc/reference/runtimes/2023.1.html

Change-Id: I3f05590f48c026eabc02b84b2c7e213bd1dfe220

.zuul.d/jobs.yaml

@@ -10,8 +10,7 @@
         - openstack-tox-py37
         - openstack-tox-py38
         - openstack-tox-py39
-        - openstack-tox-py310:
+        - openstack-tox-py310
-            voting: false
         - bashate-devstack
     gate:
       jobs:
@@ -20,6 +19,7 @@
         - openstack-tox-py37
         - openstack-tox-py38
         - openstack-tox-py39
+        - openstack-tox-py310
         - bashate-devstack
 
 - job:

setup.cfg

@@ -22,6 +22,7 @@ classifier =
     Programming Language :: Python :: 3.7
     Programming Language :: Python :: 3.8
     Programming Language :: Python :: 3.9
+    Programming Language :: Python :: 3.10
 
 [files]
 packages =