update python matrix

Author: skatsaounis

.github/workflows/ci.yml

@@ -36,8 +36,6 @@ jobs:
           - "3.8"
           - "3.9"
           - "3.10"
-          - "3.11"
-          - "3.12"
     steps:
     - name: Repository checkout
       uses: actions/checkout@v3