Update to python3.12 trixie container

We want to drop bookworm images entirely at some point in the future.
This is one step in that process. While we are at it we bump the python
version up to python3.12 and update the unittest job to match.

Change-Id: Id62f7e046d9e4ab4162fad968e774357adc68085

.zuul.yaml

@@ -23,8 +23,8 @@
     allowed-projects: opendev/grafyaml
     timeout: 2700
     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
     provides:
       - grafyaml-container-image
     dependencies:
@@ -49,8 +49,8 @@
     description: Build the grafyaml Docker image and upload to Docker Hub.
     timeout: 3600
     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
     provides: grafyaml-container-image
     vars: *grafyaml_image_vars
     secrets:
@@ -74,16 +74,16 @@
     check:
       jobs:
         - tox-pep8
-        - tox-py311:
-            nodeset: ubuntu-jammy
+        - tox-py312:
+            nodeset: ubuntu-noble
         - opendev-buildset-registry
         - grafyaml-build-image
         - project-config-grafana
     gate:
       jobs:
         - tox-pep8
-        - tox-py311:
-            nodeset: ubuntu-jammy
+        - tox-py312:
+            nodeset: ubuntu-noble
         - grafyaml-upload-image
     promote:
       jobs:

Dockerfile

@@ -16,12 +16,12 @@
 
 # Trigger rebuild - Thu Aug  7 11:28:15 PM UTC 2025
 
-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
+FROM quay.io/opendevorg/python-base:3.12-trixie
 
 COPY --from=builder /output/ /output
 RUN /output/install-from-bindep