fix: fix es6 import file extension

tests/fetchRepo.test.js

@@ -1,7 +1,7 @@
 import "@testing-library/jest-dom";
 import axios from "axios";
 import MockAdapter from "axios-mock-adapter";
-import fetchRepo from "../src/fetchers/repo-fetcher";
+import fetchRepo from "../src/fetchers/repo-fetcher.js";
 
 const data_repo = {
   repository: {