chore(deps): update dependency google-auth to v2.0.2 (#1509)

diff --git a/samples/compute/requirements.txt b/samples/compute/requirements.txt
index 0230ffa..7473ec5 100644
--- a/samples/compute/requirements.txt
+++ b/samples/compute/requirements.txt
@@ -1,3 +1,3 @@
 google-api-python-client==2.19.0
-google-auth==2.0.1
+google-auth==2.0.2
 google-auth-httplib2==0.1.0