Test python 3.11

As per the current release tested runtime, we
need to test till python 3.11 so adding the test
and updating the same in python classifier in setup.cfg

Change-Id: I08709e4da19682be2cd174ab55b0293c74cfcf06

Author: Ghanshyam Mann

.zuul.d/jobs.yaml

@@ -11,6 +11,7 @@
         - openstack-tox-py38
         - openstack-tox-py39
         - openstack-tox-py310
+        - openstack-tox-py311
         - bashate-devstack
     gate:
       jobs:
@@ -20,6 +21,7 @@
         - openstack-tox-py38
         - openstack-tox-py39
         - openstack-tox-py310
+        - openstack-tox-py311
         - bashate-devstack
 
 - job:

setup.cfg

@@ -23,6 +23,7 @@ classifier =
     Programming Language :: Python :: 3.8
     Programming Language :: Python :: 3.9
     Programming Language :: Python :: 3.10
+    Programming Language :: Python :: 3.11
 
 [files]
 packages =