chore(google_fastly_waf): Allow Terraform provider google v6 (#279)

Author: jbuck

google_fastly_waf/versions.tf

@@ -11,7 +11,7 @@ terraform {
     }
     google = {
       source  = "hashicorp/google"
-      version = "~> 5.0"
+      version = ">= 5.0"
     }
   }
 }