ci: Fix PyPI deploy (#244)

Author: janbuchar

.github/workflows/release.yaml

@@ -66,7 +66,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v5
         with:
-          python-version: 3.8
+          python-version: 3.9
 
       - name: Install dependencies
         run: make install-dev