Bump default python to 3.13 in CI tests (#2541)

Author: dpkp

.github/workflows/python-package.yml

@@ -34,14 +34,11 @@ jobs:
           - "3.5.2"
           - "3.9.0"
         python:
-          - "3.12"
+          - "3.13"
         include:
           #- python: "pypy3.9"
           #  kafka: "2.6.0"
           #  experimental: true
-          #- python: "~3.13.0-0"
-          #  kafka: "2.6.0"
-          #  experimental: true
           - python: "3.8"
             kafka: "3.9.0"
           - python: "3.9"
@@ -50,6 +47,8 @@ jobs:
             kafka: "3.9.0"
           - python: "3.11"
             kafka: "3.9.0"
+          - python: "3.12"
+            kafka: "3.9.0"
 
     steps:
       - uses: actions/checkout@v4