gh-97850: Add load_module() removal to 3.15 What's New (GH-156418)

(cherry picked from commit 7d71b3e)

Co-authored-by: Petr Viktorin <encukou@gmail.com>

Author: encukou

Doc/whatsnew/3.15.rst

@@ -2106,6 +2106,17 @@ http.server
   (Contributed by Bénédikt Tran in :gh:`133810`.)
 
 
+importlib
+---------
+
+* The ``load_module()`` methods of :class:`~importlib.abc.Loader` and its
+  subclasses is removed.
+  The import system will no longer call it when defined on custom subclasses.
+  The method has been deprecated in favor of
+  :meth:`~importlib.abc.Loader.exec_module` since Python 3.4.
+  (Contributed by Brett Cannon in :gh:`97850`.)
+
+
 importlib.resources
 -------------------