Update AutoRest C# version to 3.0.0-beta.20210826.2 (#23589)
Update AutoRest C# version to 3.0.0-beta.20210826.2 (#23589)


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