Update dependency google-auth to v1.14.0 [(#3148)](GoogleCloudPlatform/python-docs-samples#3148)

Co-authored-by: Leah E. Cole <[email protected]>

Author: renovate-bot

samples/api-client/manager/requirements.txt

@@ -2,7 +2,7 @@ cryptography==2.8
 flaky==3.6.1
 google-api-python-client==1.7.11
 google-auth-httplib2==0.0.3
-google-auth==1.11.2
+google-auth==1.14.0
 google-cloud-iot==1.0.0
 google-cloud-pubsub==1.1.0
 paho-mqtt==1.5.0