Add "Item 3" to looping workflow test scenarios.

Extended test data in `LoopingWorkflow` to include a third item, "Item 3". Updated assertions in `Tests.cs` to validate the new expected output for the additional item.

test/integration/Elsa.Workflows.IntegrationTests/Scenarios/ActivityOutputs/LoopingWorkflow.cs

@@ -12,7 +12,8 @@ public class LoopingWorkflow : WorkflowBase
         builder.Root = new ForEach<string>(
         [
             "Item 1",
-            "Item 2"
+            "Item 2",
+            "Item 3"
         ])
         {
             Body = new Sequence

test/integration/Elsa.Workflows.IntegrationTests/Scenarios/ActivityOutputs/Tests.cs

@@ -37,7 +37,8 @@ public class Tests
         Assert.Equal(new[]
         {
             "Current value: Item 1, Activity result: Item 1",
-            "Current value: Item 2, Activity result: Item 2"
+            "Current value: Item 2, Activity result: Item 2",
+            "Current value: Item 3, Activity result: Item 3"
         }, lines);
     }
 }