bug(lib): fix get dumps bad error code

meilisearch-http/tests/dumps.rs

@@ -0,0 +1,22 @@
+#![allow(dead_code)]
+mod common;
+
+use crate::common::Server;
+use serde_json::json;
+
+#[actix_rt::test]
+async fn get_unexisting_dump_status() {
+    let server = Server::new().await;
+
+    let (response, code) = server.get_dump_status("foobar").await;
+    assert_eq!(code, 404);
+
+    let expected_response = json!({
+    "message": "Dump `foobar` not found.",
+    "code": "dump_not_found",
+    "type": "invalid_request",
+    "link": "https://docs.meilisearch.com/errors#dump_not_found"
+    });
+
+    assert_eq!(response, expected_response);
+}