fix: test

crates/cdk-integration-tests/tests/nutshell_wallet.rs

@@ -5,6 +5,7 @@ use cdk_http_client::HttpClient;
 use serde::{Deserialize, Serialize};
 use serde_json::Value;
 use tokio::time::sleep;
+use cdk_http_client::RequestBuilderExt;
 
 /// Response from the invoice creation endpoint
 #[derive(Debug, Serialize, Deserialize)]