[3.14] pythongh-127945: Update What's New in Python 3.14 for free-threaded ctypes (pythonGH-134332) (python#134364)

pythongh-127945: Update What's New in Python 3.14 for free-threaded ctypes (pythonGH-134332)
(cherry picked from commit b430e92)

Co-authored-by: Kumar Aditya <[email protected]>

Author: miss-islington

Doc/whatsnew/3.14.rst

@@ -1200,6 +1200,9 @@ ctypes
   making it a :term:`generic type`.
   (Contributed by Brian Schubert in :gh:`132168`.)
 
+* :mod:`ctypes` now supports :term:`free-threading builds <free threading>`.
+  (Contributed by Kumar Aditya and Peter Bierma in :gh:`127945`.)
+
 curses
 ------