Update sdk-server-common/src/test/java/io/a2a/server/tasks/TaskManagerTest.java

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

Author: misselvexu

sdk-server-common/src/test/java/io/a2a/server/tasks/TaskManagerTest.java

@@ -211,8 +211,7 @@ public void testTaskArtifactUpdateEventAppendTrueWithExistingArtifact() throws A
                 .append(true)
                 .build();
 
-        Task saved = taskManager.saveTaskEvent(event);
-        Task updatedTask = taskManager.getTask();
+Task updatedTask = taskManager.saveTaskEvent(event);
 
         assertEquals(1, updatedTask.getArtifacts().size());
         Artifact updatedArtifact = updatedTask.getArtifacts().get(0);