DOC: Update final date for pandas 2.0 release notes (#52370)

Author: datapythonista

Diff for: doc/source/whatsnew/v2.0.0.rst

@@ -1,7 +1,7 @@
 .. _whatsnew_200:
 
-What's new in 2.0.0 (March XX, 2023)
-------------------------------------
+What's new in 2.0.0 (April 3, 2023)
+-----------------------------------
 
 These are the changes in pandas 2.0.0. See :ref:`release` for a full changelog
 including other versions of pandas.