refactor: use more clear retryer error message (2) (#3227)

tests/retryer.test.js

@@ -40,12 +40,12 @@ describe("Test Retryer", () => {
     expect(res).toStrictEqual({ data: "ok" });
   });
 
-  it("retryer should throw error if maximum retries reached", async () => {
+  it("retryer should throw specific error if maximum retries reached", async () => {
     try {
       await retryer(fetcherFail, {});
     } catch (err) {
       expect(fetcherFail).toBeCalledTimes(8);
-      expect(err.message).toBe("Maximum retries exceeded");
+      expect(err.message).toBe("Downtime due to GitHub API rate limiting");
     }
   });
 });