Bump Microsoft.NET.Test.Sdk from 17.8.0 to 18.6.0#58

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mainsimsteward/simhub-plugin:mainfrom

dependabot/nuget/src/SimSteward.Plugin.Tests/Microsoft.NET.Test.Sdk-18.6.0simsteward/simhub-plugin:dependabot/nuget/src/SimSteward.Plugin.Tests/Microsoft.NET.Test.Sdk-18.6.0Copy head branch name to clipboard