add whatsnew for GH-29403

Author: nathalier

doc/source/whatsnew/v1.0.0.rst

@@ -679,6 +679,7 @@ Datetimelike
 - Bug in :meth:`Series.var` failing to raise ``TypeError`` when called with ``timedelta64[ns]`` dtype (:issue:`28289`)
 - Bug in :meth:`DatetimeIndex.strftime` and :meth:`Series.dt.strftime` where ``NaT`` was converted to the string ``'NaT'`` instead of ``np.nan`` (:issue:`29578`)
 - Bug in :attr:`Timestamp.resolution` being a property instead of a class attribute (:issue:`29910`)
+- Bug in :func:`pandas.core.tools.datetimes.should_cache` failing for `deques` with ``TypeError`` when using the cache (:issue:`29403`)
 
 Timedelta
 ^^^^^^^^^