ci: bump python version to 3.12

Author: marcelblijleven

.github/workflows/update_readme.yaml

@@ -16,7 +16,7 @@ jobs:
     - name: Set up Python
       uses: actions/setup-python@v4
       with:
-        python-version: "3.9"
+        python-version: "3.12"
     - name: Install package
       run: |
         python -m pip install --upgrade pip