Drop support for Python 3.8, add Python 3.12

Python 3.8 goes EOL in October. We don't want to be supporting it past
then. Drop it now, adding Python 3.12 in its place.

Change-Id: Icc1558d9312cb3949d51ca26ce3fb4ddaaa8aabc
Signed-off-by: Stephen Finucane <sfinucan@redhat.com>

.zuul.yaml

@@ -1,6 +1,6 @@
 - job:
-    name: cliff-tox-py38-neutronclient-tip
-    parent: openstack-tox-py38
+    name: cliff-tox-py312-neutronclient-tip
+    parent: openstack-tox-py312
     description: |
       Run unit tests for neutronclient with master branch of cliff
 
@@ -27,11 +27,12 @@
       - publish-openstack-docs-pti
     check:
       jobs:
-        - cliff-tox-py38-neutronclient-tip
-        - osc-tox-py38-tips:
+        - openstack-tox-py312
+        - cliff-tox-py312-neutronclient-tip
+        - osc-tox-py312-tips:
             branches: ^master$
     gate:
       jobs:
-        - cliff-tox-py38-neutronclient-tip
-        - osc-tox-py38-tips:
+        - cliff-tox-py312-neutronclient-tip
+        - osc-tox-py312-tips:
             branches: ^master$

setup.cfg

@@ -5,16 +5,16 @@ author = OpenStack
 author_email = openstack-discuss@lists.openstack.org
 summary = Command Line Interface Formulation Framework
 home_page = https://docs.openstack.org/cliff/latest/
-python_requires = >=3.8
+python_requires = >=3.9
 classifier =
     Development Status :: 5 - Production/Stable
     License :: OSI Approved :: Apache Software License
     Programming Language :: Python
     Programming Language :: Python :: 3
-    Programming Language :: Python :: 3.8
     Programming Language :: Python :: 3.9
     Programming Language :: Python :: 3.10
     Programming Language :: Python :: 3.11
+    Programming Language :: Python :: 3.12
     Programming Language :: Python :: 3 :: Only
     Programming Language :: Python :: Implementation :: CPython
     Intended Audience :: Developers