chore(ci): test with Python 3.13

.github/workflows/pythonpackage.yml

@@ -17,6 +17,7 @@ jobs:
         - '3.10'
         - '3.11'
         - '3.12'
+        - '3.13'
 
     steps:
     - uses: actions/checkout@v4
@@ -26,6 +27,7 @@ jobs:
         python-version: ${{ matrix.python-version }}
         cache: pip
         cache-dependency-path: requirements*.txt
+        allow-prereleases: true
     - run: pip install -r requirements-test.txt
     - name: Compile
       env: