Upgrade Python version in tests

Author: fcollonval

.github/workflows/tests.yml

@@ -19,7 +19,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, windows-latest, macos-latest]
-        python-version: ["3.8", "3.12"]
+        python-version: ["3.9", "3.13"]
         include:
           - os: windows-latest
             python-version: "3.9"