test: use python 3.11

Author: matinnuhamunada

.github/workflows/push.yml

@@ -90,7 +90,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: actions/setup-python@v4
         with:
-          python-version: 3.x
+          python-version: 3.11
       - run: pip install bgcflow_wrapper
       - run: pip install pytest-cov
       - run: pip install alive-progress