Add Python 3.13 to the CI config

Author: hroncok

.github/workflows/check.yml

@@ -19,7 +19,8 @@ jobs:
       fail-fast: false
       matrix:
         py:
-          - "3.12.0-rc.2"
+          - "3.13.0-alpha.2"
+          - "3.12"
           - "3.11"
           - "3.10"
           - "3.9"