docs: github action to test build should use same version rtd.org

Author: dhellmann

.github/workflows/test.yml

@@ -138,10 +138,8 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v4
         with:
-          # Pin this low because RTD doesn't seem to adopt new
-          # versions quickly and this ensures we don't have a
-          # dependency problem with importlib.metadata.
-          python-version: "3.9"
+          # Pin this to the same version used on in .readthedocs.yaml
+          python-version: "3.11"
 
       - name: Install dependencies
         run: python -m pip install tox