update grequests to v2

internal/downloader/downloader_test.go

@@ -64,7 +64,8 @@ func TestDownload(t *testing.T) {
 			"https://self-signed.badssl.com/", // Example URL that can be used
 		)
 
-		if err := ctx.Download(context.Background()); err == nil || err.Error() != "certificate from unknown authority" {
+		err := ctx.Download(context.Background())
+		if err == nil || err.Error() != "certificate from unknown authority" {
 			t.Errorf("expected certificate from unknown authority error, got %v", err)
 		}
 	})