main: Update python Docker tag to v3.13 (#1669)

Author: renovate-bot

client/python/.gitlab-ci.yml

@@ -35,16 +35,16 @@ stages:
 
 pytest-3.7:
   extends: .pytest
-  image: python:3.7-alpine
+  image: python:3.13-alpine
 pytest-3.8:
   extends: .pytest
-  image: python:3.8-alpine
+  image: python:3.13-alpine
 pytest-3.9:
   extends: .pytest
-  image: python:3.9-alpine
+  image: python:3.13-alpine
 pytest-3.10:
   extends: .pytest
-  image: python:3.10-alpine
+  image: python:3.13-alpine
 pytest-3.11:
   extends: .pytest
-  image: python:3.11-alpine
+  image: python:3.13-alpine