Update provider versions in tutorial docs

* Update terraform provider plugin version in docs to reflect
the recommended current versions that are currently used

docs/cl/google-cloud.md

@@ -49,7 +49,7 @@ Configure the Google Cloud provider to use your service account key, project-id,
 
 ```tf
 provider "google" {
-  version = "~> 2.2.0"
+  version = "~> 2.3.0"
   alias   = "default"
 
   credentials = "${file("~/.config/google-cloud/terraform.json")}"