chore(deps): update dependency google-auth to v2.2.0 (#1540)

diff --git a/samples/compute/requirements.txt b/samples/compute/requirements.txt
index d02277d..7e4bd82 100644
--- a/samples/compute/requirements.txt
+++ b/samples/compute/requirements.txt
@@ -1,3 +1,3 @@
 google-api-python-client==2.22.0
-google-auth==2.1.0
+google-auth==2.2.0
 google-auth-httplib2==0.1.0