Install using the lowest version

Author: Pliner

.github/workflows/ci.yml

@@ -45,10 +45,10 @@ jobs:
     steps:
     - name: Checkout
       uses: actions/checkout@v3
-    - name: Setup Python 3.11
+    - name: Setup Python 3.9
       uses: actions/setup-python@v3
       with:
-        python-version: '3.11'
+        python-version: '3.9'
     - name: Install dependencies
       run:
         python -m pip install -U pip wheel twine