chore: use latest pip (GoogleCloudPlatform#6964)

busunkim96 · dinagraves · leahecole · web-flow · commit 2f4395517b25 · 2021-11-10T16:30:44.000-08:00
https://pypi.org/project/pip/21.3.1/ https://pip.pypa.io/en/latest/user_guide/#changes-to-the-pip-dependency-resolver-in-20-3-2020 Co-authored-by: Dina Graves Portman <dinagraves@google.com> Co-authored-by: Leah E. Cole <6719667+leahecole@users.noreply.github.com>
diff --git a/.kokoro/docker/Dockerfile b/.kokoro/docker/Dockerfile
@@ -145,7 +145,7 @@ RUN set -ex \
 # Install pip on Python 3.6 only.
 # If the environment variable is called "PIP_VERSION", pip explodes with
 # "ValueError: invalid truth value '<VERSION>'"
-ENV PYTHON_PIP_VERSION 20.2.4
+ENV PYTHON_PIP_VERSION 21.3.1
 RUN wget --no-check-certificate -O /tmp/get-pip.py 'https://bootstrap.pypa.io/get-pip.py' \
     && python3.6 /tmp/get-pip.py "pip==$PYTHON_PIP_VERSION" \
   # we use "--force-reinstall" for the case where the version of pip we're trying to install is the same as the version bundled with Python
