Bump Microsoft.NET.Test.Sdk from 18.0.0 to 18.6.0#2322

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dependabot/nuget/Ix.NET/Source/System.Interactive.Async.Providers.Tests/Microsoft.NET.Test.Sdk-18.6.0dotnet/reactive:dependabot/nuget/Ix.NET/Source/System.Interactive.Async.Providers.Tests/Microsoft.NET.Test.Sdk-18.6.0Copy head branch name to clipboard