circleci use an older version of python (3.8.7) so s3cmd will run

s3cmd does not work with python 3.9.1 yet.

.circleci/config.yml

@@ -3,7 +3,7 @@ version: 2.1
 aliases:
   - &defaults
     docker:
-      - image: circleci/python:3.9.1-node-browsers
+      - image: circleci/python:3.8.7-node-browsers
         auth:
           username: $DOCKERHUB_USERNAME
           password: $DOCKERHUB_PASSWORD