[CI] run tests against python 3.13.2 and 3.12.9

.woodpecker/workflow.yaml

@@ -2,6 +2,11 @@ when:
   - event: push
     branch: main
 
+matrix:
+  PYTHON_VERSION:
+    - 3.13.2
+    - 3.12.9
+
 steps:
   - name: lint
     image: pipelinecomponents/ruff
@@ -9,7 +14,7 @@ steps:
       - ruff check .
 
   - name: test
-    image: python:3.13-slim
+    image: python:${PYTHON_VERSION}-slim
     environment:
       DJANGO_SETTINGS_MODULE: config.settings
       DEPLOYMENT: Test