Update AutoRest C# version#15107

Merged

1 commit merged intoAzure:masterfrom

azure-sdk:auto-update-autorest

Sep 11, 2020

Commits on Sep 11, 2020

Update AutoRest C# version to https://github.com/Azure/autorest.csharp/releases/download/3.0.0-dev.20200911.1/autorest-csharp-v3-3.0.0-dev.20200911.1.tgz
azure-sdk
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