Update container image to python3.12 and trixie

We want to drop bookworm images at some point in the future and this is
one step in that process. While we are at it we bump the python3 version
to 3.12 and update the unittest job to match.

Change-Id: Ic8f9676d275e912ecee86dc9897289b25a8eaaae

.zuul.yaml

@@ -22,8 +22,8 @@
     description: Build OpenDev Docker images for storyboard webclient
     provides: gerritbot-container-image
     requires:
-      - python-builder-3.11-bookworm-container-image
-      - python-base-3.11-bookworm-container-image
+      - python-builder-3.12-trixie-container-image
+      - python-base-3.12-trixie-container-image
     required-projects: &gerritbot_opendev_required_projects
       - opendev/gerritlib
     vars: &gerritbot_opendev_image_vars
@@ -48,8 +48,8 @@
     description: Build OpenDev gerritbot Docker images and upload to Docker Hub.
     provides: gerritbot-container-image
     requires:
-      - python-builder-3.11-bookworm-container-image
-      - python-base-3.11-bookworm-container-image
+      - python-builder-3.12-trixie-container-image
+      - python-base-3.12-trixie-container-image
     required-projects: *gerritbot_opendev_required_projects
     vars: *gerritbot_opendev_image_vars
     secrets:
@@ -71,14 +71,14 @@
     check:
       jobs:
         - tox-pep8
-        - tox-py311:
-            nodeset: ubuntu-jammy
+        - tox-py312:
+            nodeset: ubuntu-noble
         - gerritbot-build-opendev-image
     gate:
       jobs:
         - tox-pep8
-        - tox-py311:
-            nodeset: ubuntu-jammy
+        - tox-py312:
+            nodeset: ubuntu-noble
         - gerritbot-upload-opendev-image
     promote:
       jobs:

Dockerfile

@@ -13,12 +13,12 @@
 # You should have received a copy of the GNU General Public License
 # along with this software.  If not, see <http://www.gnu.org/licenses/>.
 
-FROM quay.io/opendevorg/python-builder:3.11-bookworm as builder
+FROM quay.io/opendevorg/python-builder:3.12-trixie as builder
 
 COPY . /tmp/src
 RUN assemble
 
-FROM quay.io/opendevorg/python-base:3.11-bookworm as gerritbot
+FROM quay.io/opendevorg/python-base:3.12-trixie as gerritbot
 
 COPY --from=builder /output/ /output
 RUN /output/install-from-bindep