Use only Python 3.10, 3.11 in GH tests

For some reason, reporting for Python 3.12 does not work.

.github/workflows/tox_pytests.yml

@@ -17,7 +17,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.10", "3.11", "3.12", "3.13"]
+        python-version: ["3.10", "3.11"]
 
     steps:
     - uses: actions/checkout@v1