Update inheritance tree images

contributing/development/core_and_modules/inheritance_class_tree.rst

@@ -4,26 +4,26 @@ Inheritance class tree
 Object
 ------
 
-.. image:: img/Object.png
+.. image:: img/Object.webp
 
 Reference
 ---------
 
-.. image:: img/Reference.png
+.. image:: img/RefCounted.webp
 
 Control
 -------
 
-.. image:: img/Control.png
+.. image:: img/Control.webp
 
 Node2D
 ------
 
-.. image:: img/Node2D.png
+.. image:: img/Node2D.webp
 
 Node3D
 ------
 
-.. image:: img/Spatial.png
+.. image:: img/Node3D.webp
 
 Source files: :download:`class_tree.zip <files/class_tree.zip>`.