Update python Docker tag to v3.12

.gitlab-ci.yml

@@ -22,7 +22,7 @@ stages:
       - Dockerfile
 
 run_test_cases:
-  image: python:3.9
+  image: python:3.12
   stage: test
   before_script:
     - *install_requirements
@@ -35,7 +35,7 @@ run_test_cases:
       junit: report.xml
 
 check_coverage:
-  image: python:3.9
+  image: python:3.12
   stage: test
   needs: ["run_test_cases"]
   before_script:
@@ -51,7 +51,7 @@ check_coverage:
         path: coverage.xml
 
 check_style:
-  image: python:3.9
+  image: python:3.12
   stage: test
   needs: ["run_test_cases"]
   before_script:

Dockerfile

-FROM python:3.9-slim
+FROM python:3.12-slim
 LABEL maintainer="Loxbie <ole@freirad.at>"
 
 # System Dependencies