Re-specify Iterator<Attribute> type

(Weird that it compiles & runs OK in editor without the seemingly redundant type, but blows up in the runner.)

src/main/java/org/jsoup/nodes/Attributes.java

@@ -348,7 +348,7 @@ public Range.AttributeRange sourceRange(String key) {
 
     @Override
     public Iterator<Attribute> iterator() {
-        return new Iterator<>() {
+        return new Iterator<Attribute>() {
             int expectedSize = size;
             int i = 0;