Update Qt5

[Ruben Di Battista]

Hello, 

I’m working on pushing the new version of ParaView. It currently has problems 
with Qt 5.11 and it’s reported in the Kitware Gitlab issue tracker that with 
the new Qt (5.12.2) on Mojave, the problems vanish. Can we bump up the Qt 
version so I’ll try to build with the latest commit of ParaView and see if the 
problem is really solved?

Thanks, 

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