Remove unnecessary whatsnew note

Author: heoh

doc/source/whatsnew/v3.0.0.rst

@@ -942,7 +942,6 @@ Numeric
 
 Conversion
 ^^^^^^^^^^
-- Bug in :meth:`BaseMaskedArray._cast_pointwise_result` with all-NA values results returned ``object`` dtype instead of preserving the original dtype (:issue:`62344`)
 - Bug in :meth:`DataFrame.astype` not casting ``values`` for Arrow-based dictionary dtype correctly (:issue:`58479`)
 - Bug in :meth:`DataFrame.update` bool dtype being converted to object (:issue:`55509`)
 - Bug in :meth:`Series.astype` might modify read-only array inplace when casting to a string dtype (:issue:`57212`)