removes the ItemGroup.Using Include=Xunit

src/Yavsc.Org.Tests/NonRegression/PerformerCodeInputValidationTests.cs

@@ -1,6 +1,7 @@
 using System.ComponentModel.DataAnnotations;
 using Yavsc.Models.Relationship;
 using Yavsc.Models.Workflow;
+using Xunit;
 
 namespace Yavsc.Tests.NonRegression;
 
@@ -73,4 +74,4 @@ public class PerformerCodeInputValidationTests
         Validator.TryValidateObject(profile, ctx, results, validateAllProperties: true);
         return results;
     }
-}
+}