Update tested python versions

Author: cjrh

.github/workflows/pythonapp.yml

@@ -9,7 +9,7 @@ jobs:
     timeout-minutes: 5
     strategy:
       matrix:
-        python-version: ['3.6', '3.7', '3.8', '3.9', '3.10', 'pypy3']
+        python-version: ['3.6', '3.7', '3.8', '3.9', '3.10', '3.11', '3.12', '3.13', 'pypy3']
         os: [ubuntu-latest, windows-latest, macOS-latest]
         exclude:
           - os: macOS-latest
@@ -23,7 +23,7 @@ jobs:
       uses: actions/setup-python@v1
       with:
         python-version: ${{ matrix.python-version }}
-        architecture: x64  
+        architecture: x64
     - name: Install dependencies
       run: |
         python -m pip install -U pip wheel