Add requirements-tox-py312-check-uc job

Test requirements against Python 3.12, but make it non-voting for now.

Change-Id: I37b862363b35e99a0a6adc7868ad68bd3d5ea9dd

.zuul.d/jobs.yaml

@@ -52,6 +52,16 @@
     files: ^upper-constraints.*txt$
     vars:
       tox_envlist: py311-check-uc
+- job:
+    name: requirements-tox-py312-check-uc
+    parent: openstack-tox-py312
+    description: |
+      Run test for requirements project.
+
+      Uses tox with the ``py312-check-uc`` environment.
+    files: ^upper-constraints.*txt$
+    vars:
+      tox_envlist: py312-check-uc
 
 - job:
     name: requirements-tox-py38-check-uc-no-wheels

.zuul.d/project.yaml

@@ -20,6 +20,8 @@
         - requirements-tox-py39-check-uc
         - requirements-tox-py310-check-uc
         - requirements-tox-py311-check-uc
+        - requirements-tox-py312-check-uc:
+            voting: false
         - requirements-tox-validate-projects:
             voting: false
         - cross-aodh-py311

tox.ini

@@ -36,6 +36,11 @@ basepython = python3.11
 deps = -r{toxinidir}/upper-constraints.txt
 commands = check-conflicts {toxinidir}/upper-constraints.txt {toxinidir}/upper-constraints-xfails.txt
 
+[testenv:py312-check-uc]
+basepython = python3.12
+deps = -r{toxinidir}/upper-constraints.txt
+commands = check-conflicts {toxinidir}/upper-constraints.txt {toxinidir}/upper-constraints-xfails.txt
+
 [testenv:venv]
 commands = {posargs}