fix: re-add python to the action because it didn't build without it

Author: schnaitter

.github/workflows/deploy.yml

@@ -30,6 +30,11 @@ jobs:
       - name: Setup Pages
         uses: actions/configure-pages@v3
 
+      - name: Install Python
+        uses: actions/setup-python@v5
+        with:
+          python-version-file: '.python-version'
+
       - name: Install uv
         uses: astral-sh/setup-uv@v3
         with: