Update testing version

Author: davidhozic

.github/workflows/python-tests.yml

@@ -18,7 +18,7 @@ jobs:
       max-parallel: 1
       fail-fast: false
       matrix:
-        python-version: ["3.9", "3.11"]
+        python-version: ["3.9", "3.13"]
     steps:
     - uses: actions/checkout@v4
     - name: Set up Python ${{ matrix.python-version }}