[3.12] GH-109975: Announce final release in What's New in Python 3.13 (GH-125007) (#125034)

Prepare What's New in Python 3.13 for final release
(cherry picked from commit 31516c9)

Co-authored-by: Adam Turner <[email protected]>

Author: Yhg1s

Doc/whatsnew/3.12.rst

@@ -59,7 +59,7 @@ Summary -- Release highlights
 .. This section singles out the most important changes in Python 3.12.
    Brevity is key.
 
-Python 3.12 is the latest stable release of the Python programming language,
+Python 3.12 is a stable release of the Python programming language,
 with a mix of changes to the language and the standard library.
 The library changes focus on cleaning up deprecated APIs, usability, and correctness.
 Of note, the :mod:`!distutils` package has been removed from the standard library.