fix TestTelegramConfirmedRequest failing in GitHub Actions

The reason is likely slow work of goroutines due to limited CPU.

provider/telegram_test.go

@@ -142,7 +142,7 @@ func TestTelegramConfirmedRequest(t *testing.T) {
 	servedToken = resp.Token
 	mu.Unlock()
 
-	time.Sleep(apiPollInterval * 2)
+	time.Sleep(apiPollInterval * 3)
 
 	// The token should be confirmed by now
 	r = httptest.NewRequest("GET", fmt.Sprintf("/?token=%s", resp.Token), nil)