Bump Microsoft.NET.Test.Sdk from 17.8.0 to 18.3.0#4

dependabot[bot] wants to merge 1 commit intomasterjavaChip56/EndpointHealthCheck:masterfrom

dependabot/nuget/tests/ApiHealthDashboard.Tests/Microsoft.NET.Test.Sdk-18.3.0javaChip56/EndpointHealthCheck:dependabot/nuget/tests/ApiHealthDashboard.Tests/Microsoft.NET.Test.Sdk-18.3.0Copy head branch name to clipboard