Add support for Python 3.12

Closes #314 (closed)

Refs https://gitlab.teklia.com/workers/dan/-/merge_requests/197

I introduced the threshold on the attention GIF comparison because, for some reason, there was a small difference in CI but not reproducible locally.

.gitlab-ci.yml

@@ -4,7 +4,7 @@ stages:
   - deploy
 
 lint:
-  image: python:3.10
+  image: python:3.12-slim
   stage: test
 
   cache:
@@ -21,11 +21,14 @@ lint:
   before_script:
     - pip install pre-commit
 
+    # Install git
+    - apt-get update -q -y && apt-get install -q -y --no-install-recommends git
+
   script:
     - pre-commit run -a
 
 test:
-  image: python:3.10
+  image: python:3.12-slim
 
   stage: test
   cache:
@@ -65,7 +68,7 @@ docker-build:
 
 # Make sure docs still build correctly
 .docs:
-  image: python:3.10
+  image: python:3.12
   artifacts:
     paths:
       - public
@@ -147,7 +150,7 @@ docs-stop-surge:
 
 deploy-pypi:
   stage: deploy
-  image: python:3.10
+  image: python:3.12
 
   only:
     - tags