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Cancellation of FtpConnection.ReadFromStreamAsync causes UnobservedTaskException

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In [FtpConnection.ReadFromStreamAsync](https://github.com/FubarDevelopment/FtpServer/blob/ee1ba0897bad8727b6cb2d26f21f89e2ff9da351/src/FubarDev.FtpServer/FtpConnection.cs#L936), `readTask` is started using the cancellation token passed into the method, but `tcs` is also created which has its result set when the cancellation token is cancelled: ```csharp...