Update CI for Gazpacho

Add Python 3.13 functional tests, as per
https://governance.openstack.org/tc/reference/runtimes/2026.1.html

Given that our functional tests are devstack-based, the python 3.10
functional job is made non-voting because there is no supported
py3.10 platform for devstack following change I796eddac96313584f4a.

Change-Id: I584f4348b880ef1409328a70658ed0697e225cf5
Signed-off-by: Brian Rosmaita <rosmaita.fossdev@gmail.com>

.zuul.yaml

@@ -3,7 +3,11 @@
     abstract: true
     parent: devstack-tox-functional
     description: |
-      devstack-based functional tests for python-brick-cinderclient-ext
+      Abstract job for defining devstack-based functional test jobs for
+      python-brick-cinderclient-ext.  Jobs for particular python versions
+      use this job as a parent, and control what verison of python is used
+      by specifying a nodeset having the desired version of python as the
+      system default.
     required-projects:
       - openstack/python-cinderclient
     timeout: 4200
@@ -50,15 +54,23 @@
     # Python 3.10 is the default on Ubuntu 22.04 (Jammy)
     nodeset: openstack-single-node-jammy
     vars:
-      python_version: 3.10
+      devstack_localrc:
+        # current master devstack no longer supports jammy as a platform
+        # (change I796eddac96313584f4a), so we must force install it
+        FORCE: 'yes'
+      bindep_profile: test py310
+      python_version: '3.10'
       tox_envlist: functional-py310
 
 - job:
-    name: brick-cinderclient-dsvm-functional-py312
+    name: brick-cinderclient-dsvm-functional-py313
     parent: brick-cinderclient-dsvm-functional-base
+    # Python 3.13 is the default on Debian Trixie
+    nodeset: devstack-single-node-debian-trixie
     vars:
-      python_version: 3.12
-      tox_envlist: functional-py312
+      bindep_profile: test py313
+      python_version: '3.13'
+      tox_envlist: functional-py313
 
 - project:
     templates:
@@ -68,9 +80,11 @@
       - release-notes-jobs-python3
     check:
       jobs:
-        - brick-cinderclient-dsvm-functional-py310
-        - brick-cinderclient-dsvm-functional-py312
+        - brick-cinderclient-dsvm-functional-py310:
+            # non-voting because devstack support on python 3.10
+            # is no longer tested (see change I796eddac96313584f4a)
+            voting: false
+        - brick-cinderclient-dsvm-functional-py313
     gate:
       jobs:
-        - brick-cinderclient-dsvm-functional-py310
-        - brick-cinderclient-dsvm-functional-py312
+        - brick-cinderclient-dsvm-functional-py313