Bump Microsoft.NET.Test.Sdk from 17.14.1 to 18.8.1#5

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dependabot/nuget/tests/DisplayForge.Core.Tests/Microsoft.NET.Test.Sdk-18.8.1dreamingdog0529/DisplayForge:dependabot/nuget/tests/DisplayForge.Core.Tests/Microsoft.NET.Test.Sdk-18.8.1Copy head branch name to clipboard