ci: set the Python version

.github/workflows/deploy.yml

@@ -32,6 +32,8 @@ jobs:
         uses: actions/configure-pages@v3
       - name: Setup Python
         uses: actions/setup-python@v5
+        with: 
+          python-version: "3.12"
       - name: Install Python dependencies
         run: python -m pip install pyyaml
       - uses: actions/setup-node@v4