Bump cloud.google.com/go from 0.38.0 to 0.54.0

Bumps [cloud.google.com/go](https://github.com/GoogleCloudPlatform/gcloud-golang) from 0.38.0 to 0.54.0.
- [Release notes](https://github.com/GoogleCloudPlatform/gcloud-golang/releases)
- [Changelog](https://github.com/googleapis/google-cloud-go/blob/master/CHANGES.md)
- [Commits](googleapis/google-cloud-go@v0.38.0...v0.54.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

go.mod

@@ -3,7 +3,7 @@ module github.com/NYTimes/gizmo
 go 1.12
 
 require (
-	cloud.google.com/go v0.38.0
+	cloud.google.com/go v0.54.0
 	contrib.go.opencensus.io/exporter/stackdriver v0.12.2
 	github.com/NYTimes/logrotate v1.0.0
 	github.com/Shopify/sarama v1.23.1