Update AutoRest C# version (#21610)
Update AutoRest C# version (#21610)

Update AutoRest C# version to 3.0.0-beta.20210604.4
AsrOneSdk/azure-sdk-for-net,AsrOneSdk/azure-sdk-for-net,AsrOneSdk/azure-sdk-for-net,AsrOneSdk/azure-sdk-for-net