Update CI for Dalmatian

Updates:
- added functional py312 testenv to tox.ini (not needed for unit tests)
- removed py38 classifier from setup.cfg, but did not change python_requires (currently it's >=3.8)
- run py311 func job in gate (was py310)

Change-Id: I257aa78d8f903f4c009d12a072c53b73e05a18d7

.zuul.yaml

@@ -53,13 +53,13 @@
       tox_envlist: functional-py39
 
 - job:
-    name: brick-cinderclient-dsvm-functional-py310
+    name: brick-cinderclient-dsvm-functional-py311
     parent: brick-cinderclient-dsvm-functional-base
-    # python 3.10 is the default in ubuntu 22.04 (jammy)
-    nodeset: openstack-single-node-jammy
+    # use debian bookworm, where py3.11 is the default
+    nodeset: devstack-single-node-debian-bookworm
     vars:
-      python_version: 3.10
-      tox_envlist: functional-py310
+      python_version: 3.11
+      tox_envlist: functional-py311
 
 - project:
     templates:
@@ -70,8 +70,8 @@
     check:
       jobs:
         - brick-cinderclient-dsvm-functional-py39
-        - brick-cinderclient-dsvm-functional-py310
+        - brick-cinderclient-dsvm-functional-py311
     gate:
       jobs:
         - brick-cinderclient-dsvm-functional-py39
-        - brick-cinderclient-dsvm-functional-py310
+        - brick-cinderclient-dsvm-functional-py311

setup.cfg

@@ -16,7 +16,6 @@ classifiers =
     Programming Language :: Python :: 3 :: Only
     Programming Language :: Python :: Implementation :: CPython
     Programming Language :: Python :: 3
-    Programming Language :: Python :: 3.8
     Programming Language :: Python :: 3.9
     Programming Language :: Python :: 3.10
     Programming Language :: Python :: 3.11

tox.ini

@@ -45,7 +45,7 @@ setenv =
   OS_TEST_PATH=./brick_cinderclient_ext/tests/functional
 passenv = OS_*
 
-[testenv:functional-py{3,38,39,310,311}]
+[testenv:functional-py{3,38,39,310,311,312}]
 setenv =
   {[testenv:functional]setenv}