Update AutoRest C# version (#12739)

Co-authored-by: Pavel Krymets <pavel@krymets.com>

common/ManagementTestShared/ManagementRecordedTestBase.cs

@@ -56,15 +56,15 @@ protected async Task CleanupResourceGroupsAsync()
                 var resourceGroupsClient = new ResourcesManagementClient(
                     TestEnvironment.SubscriptionId,
                     TestEnvironment.Credential,
-                    new ResourcesManagementClientOptions()).GetResourceGroupsClient();
+                    new ResourcesManagementClientOptions()).ResourceGroups;
                 foreach (var resourceGroup in CleanupPolicy.ResourceGroupsCreated)
                 {
                     await resourceGroupsClient.StartDeleteAsync(resourceGroup);
                 }
             }
         }
 
-        protected async Task<string> GetFirstUsableLocationAsync(ProvidersClient providersClient, string resourceProviderNamespace, string resourceType)
+        protected async Task<string> GetFirstUsableLocationAsync(ProvidersOperations providersClient, string resourceProviderNamespace, string resourceType)
         {
             var provider = (await providersClient.GetAsync(resourceProviderNamespace)).Value;
             return provider.ResourceTypes.Where(

eng/CodeGeneration.targets

@@ -3,7 +3,7 @@
   <PropertyGroup>
     <_AutoRestVersion>https://github.com/Azure/autorest/releases/download/autorest-3.0.6223/autorest-3.0.6223.tgz</_AutoRestVersion>
     <_AutoRestCoreVersion>3.0.6283</_AutoRestCoreVersion>
-    <_AutoRestCSharpVersion>https://github.com/Azure/autorest.csharp/releases/download/3.0.0-dev.20200610.1/autorest-csharp-v3-3.0.0-dev.20200610.1.tgz</_AutoRestCSharpVersion>
+    <_AutoRestCSharpVersion>https://github.com/Azure/autorest.csharp/releases/download/3.0.0-dev.20200612.2/autorest-csharp-v3-3.0.0-dev.20200612.2.tgz</_AutoRestCSharpVersion>
     <_SupportsCodeGeneration Condition="'$(IsClientLibrary)' == 'true'">true</_SupportsCodeGeneration>
     <_DefaultInputName Condition="Exists('$(MSBuildProjectDirectory)/autorest.md')">$(MSBuildProjectDirectory)/autorest.md</_DefaultInputName>
     <AutoRestInput Condition="'$(AutoRestInput)' == ''">$(_DefaultInputName)</AutoRestInput>
@@ -51,3 +51,4 @@
 
 
 
+