Use python 3.12 in ci.yml

Author: spalmurray

.github/workflows/ci.yml

@@ -28,10 +28,10 @@ jobs:
       - uses: actions/checkout@v4
         with:
           submodules: true
-      - name: Set up Python 3.11
+      - name: Set up Python 3.12
         uses: actions/setup-python@v5
         with:
-          python-version: "3.11"
+          python-version: "3.12"
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip