Upgrade to Python 3.12

This required installing `setuptools`, as Honcho implicitly depends on it

.gitlab-ci.yml

@@ -23,7 +23,7 @@ static:
     expire_in: 2 hours
 
 pip:
-  image: python:3.11-slim
+  image: python:3.12-slim
   stage: build
   variables:
     PIP_CACHE_DIR: $CI_PROJECT_DIR/.pip-cache
@@ -45,7 +45,7 @@ pip:
     expire_in: 2 hours
 
 .python_test_template:
-  image: python:3.11-slim
+  image: python:3.12-slim
   stage: test
   dependencies:
     - pip

Dockerfile

@@ -11,7 +11,7 @@ COPY ./static/src ./static/src
 RUN npm run build
 
 # The actual container
-FROM python:3.11-slim as production
+FROM python:3.12-slim as production
 
 ENV VIRTUAL_ENV=/venv
 

dev-requirements.txt

@@ -11,3 +11,4 @@ coverage==7.4.0
 djlint==1.34.1
 types-pyyaml
 ruff==0.1.11
+setuptools  # required for Honcho to work on Python 3.12+