Bump Microsoft.NET.Test.Sdk from 17.10.0 to 18.4.0#19

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dependabot/nuget/Stwalkerster.Bot.CommandLib.Tests/Microsoft.NET.Test.Sdk-18.4.0stwalkerster/ircbot-commandlib:dependabot/nuget/Stwalkerster.Bot.CommandLib.Tests/Microsoft.NET.Test.Sdk-18.4.0Copy head branch name to clipboard