updated python matrix versions, removing 3.8 and 3.9 and adding 3.12

Author: sdirishguy

.github/workflows/ci.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.8, 3.9, "3.10", "3.11"]
+        python-version: ["3.10", "3.11", "3.12"]
     steps:
       - name: Checkout code
         uses: actions/checkout@v3