CI: Test with python 3.13

Author: HaarigerHarald

.github/workflows/tests.yml

@@ -26,7 +26,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [windows-latest, macos-latest, ubuntu-latest]
-        python-version: ["3.7", "3.11"]
+        python-version: ["3.7", "3.13"]
         exclude:
           - os: macos-latest
             python-version: "3.7"