Include python 3.9 since vercel publish seems to need it

Author: Tookmund

.github/workflows/ccadb.yml

@@ -68,7 +68,9 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v6
         with:
-          python-version: '3.11'
+          python-version: |
+            3.9
+            3.11
           cache: 'pip'
 
       - name: Install Python dependencies