Test Python 3.13.

Author: Kodiologist

.github/workflows/tests.yaml

@@ -9,7 +9,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python: ['3.10', 3.11, 3.12, pypy-3.10]
+        python: ['3.10', 3.11, 3.12, 3.13, pypy-3.10]
 
     steps:
     - uses: actions/checkout@v4