Bump Microsoft.NET.Test.Sdk from 17.0.0 to 18.4.0#8

dependabot[bot] wants to merge 1 commit intomainCleverCodeCravers/website-validator:mainfrom

dependabot/nuget/source/WebsiteValidator/WebsiteValidator.BL.Tests/Microsoft.NET.Test.Sdk-18.4.0CleverCodeCravers/website-validator:dependabot/nuget/source/WebsiteValidator/WebsiteValidator.BL.Tests/Microsoft.NET.Test.Sdk-18.4.0Copy head branch name to clipboard