Clean up CI jobs

We no longer need our own py311 job; there is now an openstack-tox-py311
included in openstack-python3-jobs (though we want to make it voting).

Additionally, that template has marked py39 and py310 jobs as voting, so
we no longer need to do that ourselves.

Change-Id: Ie964678af069d5255e463ef22b1b53957d28f918

.zuul.yaml

@@ -29,14 +29,6 @@
       # swift can use different tox env names
       tox_envlist: func
 
-- job:
-    name: swiftclient-tox-py311
-    parent: openstack-tox-py310
-    vars:
-      tox_envlist: py311
-      bindep_profile: test py311
-      python_version: '3.11'
-
 - project:
     templates:
       - check-requirements
@@ -53,20 +45,14 @@
       jobs:
         - swiftclient-swift-functional
         - swiftclient-functional
-        - openstack-tox-py39:
+        - openstack-tox-py311:
             voting: true
-        - openstack-tox-py310:
-            voting: true
-        - swiftclient-tox-py311
     gate:
       jobs:
         - swiftclient-swift-functional
         - swiftclient-functional
-        - openstack-tox-py39:
+        - openstack-tox-py311:
             voting: true
-        - openstack-tox-py310:
-            voting: true
-        - swiftclient-tox-py311
     post:
       jobs:
         - openstack-tox-cover