[3.12] gh-84976: Add back UTC to datetime.__all__ (GH-104920) (#106019)

Co-authored-by: Shantanu <[email protected]>

Author: miss-islington

Lib/datetime.py

@@ -6,4 +6,4 @@
     from _pydatetime import __doc__
 
 __all__ = ("date", "datetime", "time", "timedelta", "timezone", "tzinfo",
-           "MINYEAR", "MAXYEAR")
+           "MINYEAR", "MAXYEAR", "UTC")