Revert "use python 3.11"

This reverts commit ae6adb7.

Author: blink1073

.evergreen/scripts/run-aws-container-test.sh

@@ -20,7 +20,7 @@ fi
 set -o xtrace
 
 # Install python with pip.
-PYTHON_VER="python3.11"
+PYTHON_VER="python3.9"
 apt-get -qq update  < /dev/null > /dev/null
 apt-get -qq install $PYTHON_VER $PYTHON_VER-venv build-essential $PYTHON_VER-dev -y  < /dev/null > /dev/null