Convert :issue: to :gh: in whatsnew (GH-92089)

Author: sweeneyde

Doc/whatsnew/3.11.rst

@@ -1059,7 +1059,7 @@ Deprecated
   a :exc:`DeprecationWarning`.
   In a future Python version they will be a :exc:`SyntaxWarning` and
   eventually a :exc:`SyntaxError`.
-  (Contributed by Serhiy Storchaka in :issue:`81548`.)
+  (Contributed by Serhiy Storchaka in :gh:`81548`.)
 
 * The :mod:`lib2to3` package and ``2to3`` tool are now deprecated and may not
   be able to parse Python 3.10 or newer. See the :pep:`617` (New PEG parser for