Environment updates

Author: ParamThakkar123

.github/unittest/linux_libs/scripts_procgen/setup_env.sh

@@ -8,9 +8,6 @@
 set -e
 set -v
 
-# default to Python 3.9 if not provided by CI
-PYTHON_VERSION="${PYTHON_VERSION:-3.9}"
-
 apt-get update && apt-get upgrade -y && apt-get install -y git cmake
 # Avoid error: "fatal: unsafe repository"
 git config --global --add safe.directory '*'