chore(deps): update dependency google-auth to v2 (#1489)

diff --git a/samples/compute/requirements.txt b/samples/compute/requirements.txt
index e58ad15..24e75e8 100644
--- a/samples/compute/requirements.txt
+++ b/samples/compute/requirements.txt
@@ -1,3 +1,3 @@
 google-api-python-client==2.17.0
-google-auth==1.35.0
+google-auth==2.0.1
 google-auth-httplib2==0.1.0