ci: add Python 3.13 to test matrix in workflow

Author: teocns

.github/workflows/python-tests.yaml

@@ -29,7 +29,7 @@ jobs:
 
     strategy:
       matrix:
-        python-version: ["3.9", "3.10", "3.11", "3.12"]
+        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13"]
       fail-fast: false
 
     steps: