GH-109975: Copyedit 3.13 What's New: Note delayed expected release date for Python 3.13.0 (GH-124827)

Note delayed expected release date of 3.13.0

Author: AA-Turner

Doc/whatsnew/3.13.rst

@@ -46,7 +46,7 @@
    when researching a change.
 
 This article explains the new features in Python 3.13, compared to 3.12.
-Python 3.13 will be released on October 1, 2024.
+Python 3.13 will be released on October 7, 2024.
 For full details, see the :ref:`changelog <changelog>`.
 
 .. seealso::