fix code

hutool-json/src/test/java/cn/hutool/json/Issue2749Test.java

@@ -14,13 +14,13 @@ import java.util.Map;
  */
 public class Issue2749Test {
 
+	@SuppressWarnings("unchecked")
 	@Test
 	@Ignore
 	public void jsonObjectTest() {
 		final Map<String, Object> map = new HashMap<>(1, 1f);
 		Map<String, Object> node = map;
 		for (int i = 0; i < 1000; i++) {
-			//noinspection unchecked
 			node = (Map<String, Object>) node.computeIfAbsent("a", k -> new HashMap<String, Object>(1, 1f));
 		}
 		node.put("a", 1);