Update AutoRest C# version to 3.0.0-beta.20210822.2 (#23469)
Update AutoRest C# version to 3.0.0-beta.20210822.2 (#23469)


AsrOneSdk/azure-sdk-for-net,AsrOneSdk/azure-sdk-for-net,AsrOneSdk/azure-sdk-for-net,AsrOneSdk/azure-sdk-for-net