Remove copyright and license comments

Removed copyright notice and license information from the file.

Author: miedema-11

PWGUD/Tasks/flowCumulantsUpc.cxx

@@ -4,16 +4,6 @@
  * granted to it by virtue of its status as an Intergovernmental Organization
  * or submit itself to any jurisdiction.
  */
-// Copyright 2019-2020 CERN and copyright holders of ALICE O2.
-// See https://alice-o2.web.cern.ch/copyright for details of the copyright holders.
-// All rights not expressly granted are reserved.
-//
-// This software is distributed under the terms of the GNU General Public
-// License v3 (GPL Version 3), copied verbatim in the file "COPYING".
-//
-// In applying this license CERN does not waive the privileges and immunities
-// granted to it by virtue of its status as an Intergovernmental Organization
-// or submit itself to any jurisdiction.
 
 /// \file   flowCumulantsUpc.cxx
 /// \author Yongxi Du (yongxi.du@cern.ch), Mingrui Zhao (mingrui.zhao@mail.labz0.org, mingrui.zhao@cern.ch)