update python from 3.9 to 3.11 in github actions (#84)

Author: colinthebomb1

.github/workflows/pytest.yaml

@@ -10,7 +10,7 @@ jobs:
 
     strategy:
       matrix:
-        python-version: ["3.9", "3.10"]
+        python-version: ["3.10", "3.11"]
 
     steps:
     - uses: actions/checkout@v4