Fix gcp-csharp example

gcp-csharp/Program.cs

@@ -1,23 +1,7 @@
-using System.Collections.Generic;
-using System.Threading.Tasks;
-
+using System.Threading.Tasks;
 using Pulumi;
-using Pulumi.Gcp.Storage;
 
 class Program
 {
-    static Task<int> Main()
-    {
-        return Deployment.RunAsync(() => {
-
-            // Create a GCP resource (Storage Bucket)
-            var bucket = new Bucket("my-bucket");
-
-            // Export the DNS name of the bucket
-            return new Dictionary<string, object?>
-            {
-                { "bucketName", bucket.Url },
-            };
-        });
-    }
+    static Task<int> Main() => Deployment.RunAsync<MyStack>();
 }