Add Python 3.12 and use Python 3.12 mainly

{{cookiecutter.project_slug}}/.gitlab-ci.yml

@@ -70,8 +70,24 @@ test-py3.10:
         - make test
     <<: *junit_definition
 
+test-py3.11:
+    image: docker.km3net.de/base/python:3.11
+    stage: test
+    script:
+        - *virtualenv_definition
+        - make test
+    <<: *junit_definition
+
+test-py3.12:
+    image: git.km3net.de:4567/common/dockerfiles/base/python:3.12
+    stage: test
+    script:
+        - *virtualenv_definition
+        - make test
+    <<: *junit_definition
+
 code-style:
-    image: docker.km3net.de/base/python:3.9
+    image: git.km3net.de:4567/common/dockerfiles/base/python:3.12
     stage: test
     script:
         - *virtualenv_definition
@@ -79,7 +95,7 @@ code-style:
     allow_failure: true
 
 coverage:
-    image: docker.km3net.de/base/python:3.9
+    image: git.km3net.de:4567/common/dockerfiles/base/python:3.12
     stage: coverage
     script:
         - *virtualenv_definition
@@ -92,7 +108,7 @@ coverage:
 
 
 build-docs:
-    image: docker.km3net.de/base/python:3.9
+    image: git.km3net.de:4567/common/dockerfiles/base/python:3.12
     stage: doc
     script:
         - *virtualenv_definition
@@ -100,7 +116,7 @@ build-docs:
     cache: {}
 
 pages:
-    image: docker.km3net.de/base/python:3.9
+    image: git.km3net.de:4567/common/dockerfiles/base/python:3.12
     stage: doc
     script:
         - *virtualenv_definition
@@ -117,7 +133,7 @@ pages:
 
 
 pypi:
-    image: docker.km3net.de/base/python:3.9
+    image: git.km3net.de:4567/common/dockerfiles/base/python:3.12
     stage: release
     cache: {}
     script: