update CI python versions

.github/workflows/ci.yml

@@ -9,7 +9,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, windows-latest]
-        python-version: ['3.8', '3.9', '3.10', '3.11']
+        python-version: ['3.9', '3.10', '3.11', '3.12']
 
     steps:
     - uses: actions/checkout@v4
@@ -23,7 +23,7 @@ jobs:
       run: |
         python3 -m pip install --upgrade pip setuptools wheel
         pip install .
- 
+
     - name: Build documentation and examples
       run: |
         pip install -r docs/requirements.txt