[3.13] gh-128307: Update what's new in 3.13 with create_task changes of asyncio (#134304) (#134335)

(It's complicated.)

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

Author: gvanrossum

Doc/whatsnew/3.13.rst

@@ -739,6 +739,22 @@ asyncio
   never awaited).
   (Contributed by Arthur Tacca and Jason Zhang in :gh:`115957`.)
 
+* The function and methods named ``create_task`` have received a new
+  ``**kwargs`` argument that is passed through to the task constructor.
+  This change was accidentally added in 3.13.3,
+  and broke the API contract for custom task factories.
+  Several third-party task factories implemented workarounds for this.
+  In 3.13.4 and later releases the old factory contract is honored
+  once again (until 3.14).
+  To keep the workarounds working, the extra ``**kwargs`` argument still
+  allows passing additional keyword arguments to :class:`~asyncio.Task`
+  and to custom task factories.
+
+  This affects the following function and methods:
+  :meth:`asyncio.create_task`,
+  :meth:`asyncio.loop.create_task`,
+  :meth:`asyncio.TaskGroup.create_task`.
+  (Contributed by Thomas Grainger in :gh:`128307`.)
 
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