Add Python 3.13 to tests.

Author: auouymous

.github/workflows/python-package.yml

@@ -14,7 +14,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        python-version: [3.8, 3.9, '3.10', 3.11, 3.12]
+        python-version: [3.8, 3.9, '3.10', 3.11, 3.12, 3.13]
     steps:
     - uses: actions/checkout@v4
     - name: Set up Python ${{ matrix.python-version }}