FIX: github actions: limit python versions to >= 3.11

Author: gabrielfalcao

.github/workflows/pythonapp.yml

@@ -18,8 +18,8 @@ jobs:
           # - "3.8"
           # - "3.9"
           # - "3.10"
-          # - "3.11"
           # # it appears that sphinx 8.2.1 requires python version >= 3.11
+          - "3.11"
           - "3.12"
           # IMPORTANT: update the documentation file ../../docs/source/getting-started.rst when adding more python versions to the list above