fix syntax for aws s3 sync

Author: mmcky

.github/workflows/deploy-s3.yml

@@ -38,4 +38,4 @@ jobs:
           aws-region: ap-southeast-2
       - name: Copy files to S3 with the AWS CLI
         run: |
-          aws s3 sync _build/website/jupyter_html/* s3://test.python.quantecon.org/
+          aws s3 sync _build/website/jupyter_html/ s3://test.python.quantecon.org/