chore(deps): update python docker tag to v3.12

This MR contains the following updates:

Package	Type	Update	Change
python	image	minor	3.11-alpine -> 3.12-alpine

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.gitlab-ci.yml

@@ -6,7 +6,7 @@ stages:
 
 lint:
   stage: lint
-  image: python:3.11-alpine
+  image: python:3.12-alpine
   before_script: pip install black
   script: black --check .