Bump Microsoft.NET.Test.Sdk from 17.8.0 to 18.7.0#27

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dependabot/nuget/tests/RetireaBot.Tests/Microsoft.NET.Test.Sdk-18.7.0microsoft/ProjectRetireabot:dependabot/nuget/tests/RetireaBot.Tests/Microsoft.NET.Test.Sdk-18.7.0Copy head branch name to clipboard