Bump Microsoft.NET.Test.Sdk from 17.12.0 to 18.4.0#9

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mainSURUJ404/Machine-code-specifications:mainfrom

dependabot/nuget/src/Machine.Specifications.Core.Specs/multi-d677f9048eSURUJ404/Machine-code-specifications:dependabot/nuget/src/Machine.Specifications.Core.Specs/multi-d677f9048eCopy head branch name to clipboard