Update allowedVersions for python package (#6215)

Author: jkroepke

renovate.json

@@ -136,6 +136,10 @@
       "matchUpdateTypes": [
         "major", "minor"
       ]
+    },
+    {
+      "matchPackageNames": ["python"],
+      "allowedVersions": "<=3.13"
     }
   ]
 }