Update test run python versions

Author: petri

.github/workflows/pythonpackage.yml

@@ -14,7 +14,7 @@ jobs:
     strategy:
       max-parallel: 5
       matrix:
-        python-version: [3.6, 3.7, 3.8, 3.9, 3.10, 3.11, 3.12, 'pypy3']
+        python-version: [3.9, 3.10, 3.11, 3.12, 3.13, 3.14, 'pypy3']
 
     steps:
     - uses: actions/checkout@v1