C# Task WithTimeout() extension method

Extensions.cs

    public static async Task WithTimeout(this Task task, TimeSpan timeout)
    {
        CancellationTokenSource cts = new();
        if (task == await Task.WhenAny(task, Task.Delay(timeout, cts.Token)))
        {
            cts.Cancel();
        }
        else
        {
            throw new TimeoutException();
        }
    }