Update release pipeline to Python 3.11

Needed to avoid an import incompatibility.

.github/workflows/release.yml

@@ -16,7 +16,7 @@ jobs:
     - name: Set up Python
       uses: actions/setup-python@v5
       with:
-        python-version: 3.9
+        python-version: "3.11"
     - name: Install dependencies
       run: |
         pip install -e .