Fix all Python Cookbook links (#22205)

diff --git a/Doc/library/difflib.rst b/Doc/library/difflib.rst
index aa08988..009b797 100644
--- a/Doc/library/difflib.rst
+++ b/Doc/library/difflib.rst
@@ -633,7 +633,7 @@
      work.
 
    * `Simple version control recipe
-     <https://code.activestate.com/recipes/576729/>`_ for a small application
+     <https://github.com/ActiveState/code/tree/master/recipes/Python/576729_Simple_Version_Control/recipe-576729.py>`_ for a small application
      built with :class:`SequenceMatcher`.