Use "diamond" operator.

Reported by "sonarcloud.io".
diff --git a/commons-geometry-core/src/main/java/org/apache/commons/geometry/core/partitioning/bsp/AbstractBSPTree.java b/commons-geometry-core/src/main/java/org/apache/commons/geometry/core/partitioning/bsp/AbstractBSPTree.java
index cb63df2..3825353 100644
--- a/commons-geometry-core/src/main/java/org/apache/commons/geometry/core/partitioning/bsp/AbstractBSPTree.java
+++ b/commons-geometry-core/src/main/java/org/apache/commons/geometry/core/partitioning/bsp/AbstractBSPTree.java
@@ -881,7 +881,7 @@
         /** {@inheritDoc} */
         @Override
         public Iterator<N> iterator() {
-            return new NodeIterator<P, N>(getSelf());
+            return new NodeIterator<>(getSelf());
         }
 
         /** {@inheritDoc} */