I merged this without a What's New entry to avoid merge conflicts, so here's the follow-up adding the entry.
@Kab1r do you mind reviewing?
Closes #91928
Automerge-Triggered-By: GH:pganssle
datetime
--------
+* Add :attr:`datetime.UTC`, a convenience alias for
+ :attr:`datetime.timezone.utc`. (Contributed by Kabir Kwatra in :gh:`91973`.)
* :meth:`datetime.date.fromisoformat`, :meth:`datetime.time.fromisoformat` and
:meth:`datetime.datetime.fromisoformat` can now be used to parse most ISO 8601
formats (barring only those that support fractional hours and minutes).