update python versions in workflows

Author: ckoegel

.github/workflows/test-pr.yml

@@ -35,7 +35,7 @@ jobs:
     strategy:
       matrix:
         os: [windows-2022, windows-2019, ubuntu-20.04, ubuntu-latest]
-        python-version: [3.8, 3.9, "3.10", "3.11", "3.12"]
+        python-version: [3.9, '3.10', '3.11', '3.12', '3.13']
       fail-fast: false
     env:
       PYTHON_VERSION: ${{ matrix.python-version }}