REGR: append tz-aware DataFrame with tz-naive values
Closes #35460

cc @simonjayhawkins  > #[error]doc/source/whatsnew/v1.1.2.rst:19:- Fix regression in :meth:`DataFrame.append` mixing tz-aware and tz-naive datetime columns (:issue:`35460`)  <- trailing whitespaces found

 thanks @jorisvandenbossche  @meeseeksdev backport 1.1.x