COMP: update CTK version

Brings in improvements to SuperBuild (Artichoke) process.

Brings in fixes for DICOM Database changes for #3528.

Plus some other things:

https://github.com/commontk/CTK/compare/36fb628b14e9eba019ac877c14903dbe09ec903c...8fabf8129582d7a609a8bc7c1d9b22ceb9bf3c13

git-svn-id: http://svn.slicer.org/Slicer4/trunk@22771 3bd1e089-480b-0410-8dfb-8563597acbee