Bump Microsoft.NET.Test.Sdk from 18.3.0 to 18.4.0#8

MjrTom merged 1 commit intomasterMjrTom/net-mdns:masterfrom

dependabot/nuget/test/Microsoft.NET.Test.Sdk-18.4.0MjrTom/net-mdns:dependabot/nuget/test/Microsoft.NET.Test.Sdk-18.4.0Copy head branch name to clipboard