Update python versions for testing

Given the 2025.2 (Flamingo) python runtimes [0], replace the
functional-py39 job with a functional-py310 job.  Also adjust
tox.ini to drop the functional-py38 and -py39 definitions and
add functional-py313.

[0] https://governance.openstack.org/tc/reference/runtimes/2025.2.html

Change-Id: I21ae49877d9c28b95d227e14ae580b9927d1557b

.zuul.yaml

@@ -45,12 +45,13 @@
       zuul_work_dir: src/opendev.org/openstack/python-brick-cinderclient-ext
 
 - job:
-    name: brick-cinderclient-dsvm-functional-py39
+    name: brick-cinderclient-dsvm-functional-py310
     parent: brick-cinderclient-dsvm-functional-base
-    nodeset: devstack-single-node-centos-9-stream
+    # Python 3.10 is the default on Ubuntu 22.04 (Jammy)
+    nodeset: openstack-single-node-jammy
     vars:
-      python_version: 3.9
+      python_version: 3.10
-      tox_envlist: functional-py39
+      tox_envlist: functional-py310
 
 - job:
     name: brick-cinderclient-dsvm-functional-py312
@@ -67,9 +68,9 @@
       - release-notes-jobs-python3
     check:
       jobs:
-        - brick-cinderclient-dsvm-functional-py39
+        - brick-cinderclient-dsvm-functional-py310
         - brick-cinderclient-dsvm-functional-py312
     gate:
       jobs:
-        - brick-cinderclient-dsvm-functional-py39
+        - brick-cinderclient-dsvm-functional-py310
         - brick-cinderclient-dsvm-functional-py312

tox.ini

@@ -45,7 +45,7 @@ setenv =
   OS_TEST_PATH=./brick_cinderclient_ext/tests/functional
 passenv = OS_*
 
-[testenv:functional-py{3,38,39,310,311,312}]
+[testenv:functional-py{3,310,311,312,313}]
 setenv =
   {[testenv:functional]setenv}