Bump Microsoft.NET.Test.Sdk from 17.8.0 to 18.5.1#3

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dependabot/nuget/GuitarToolkit.Tests/Microsoft.NET.Test.Sdk-18.5.1LuTiK1984/GuitarToolkit:dependabot/nuget/GuitarToolkit.Tests/Microsoft.NET.Test.Sdk-18.5.1Copy head branch name to clipboard