D19437: [knewstuff] Remove qt5.13 deprecated method

[David Faure]

dfaure accepted this revision.
This revision is now accepted and ready to land.

REPOSITORY
  R304 KNewStuff

BRANCH
  remove_deprecated_qt5.13 (branched from master)

REVISION DETAIL
  https://phabricator.kde.org/D19437

To: mlaurent, dfaure
Cc: kde-frameworks-devel, michaelh, ngraham, bruns
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