Revert "ensurepip"

This reverts commit 97b5f29.

Author: emilykl

.circleci/env_image.sh

@@ -5,7 +5,6 @@ sudo apt-get install fonts-liberation2 fonts-open-sans fonts-noto-cjk fonts-noto
 sudo python3 .circleci/download_google_fonts.py
 sudo cp -r .circleci/fonts/ /usr/share/
 sudo fc-cache -f
-sudo python3 -m ensurepip
 # install kaleido & plotly
 # sudo python3 -m pip install "plotly[kaleido]==6.1.2" --progress-bar off
 # Once new Kaleido and Plotly versions are released, uncomment the line above, update the Plotly version,