Test on python 3.13.

Author: till-m

.github/workflows/run_tests.yml

@@ -17,7 +17,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.9", "3.10", "3.11", "3.12"]
+        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13"]
         numpy-version: [">=1.25,<2", ">=2"]
 
     steps: