tree bf478db5c79feb319beb1de307092a5fadd05bb7
parent ff324844b522fef9f6f1c0830674020b8695291f
author Brendan Higgins <brendanhiggins@google.com> 1604501548 -0800
committer Brendan Higgins <brendanhiggins@google.com> 1604610217 -0800

Update Prow image to Debian Buster so that we have access to Python 3.7

Upstream KUnit depends on features only available in Python 3.7;
however, the Debian Stretch repo only has upto Python 3.5. So update
Prow to Debian Buster and Python 3.7.

Change-Id: I5771413e582064e91beaf41ed90b49a269081ae4