Bump Microsoft.NET.Test.Sdk from 17.12.0 to 18.4.0#450

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dependabot/nuget/PreMailer.Net/PreMailer.Net.Tests/Microsoft.NET.Test.Sdk-18.4.0milkshakesoftware/PreMailer.Net:dependabot/nuget/PreMailer.Net/PreMailer.Net.Tests/Microsoft.NET.Test.Sdk-18.4.0Copy head branch name to clipboard