Update VTK version

vtkLightBoxRendererManager requires
vtkPolyDataMapper2D::TransformCoordinateUseDouble, recently added
into VTK

CMakeExternals/VTK.cmake

@@ -31,7 +31,7 @@ IF(${add_project} OR CTK_LIB_Scripting/Python/Core_PYTHONQT_USE_VTK)
   
   IF(NOT DEFINED VTK_DIR)
   
-    SET(revision_tag 97b692fa7f2a6906e)
+    SET(revision_tag 0e6c2a52501efab53e1c4d74910bcb1155245e1b)
     IF(${proj}_REVISION_TAG)
       SET(revision_tag ${${proj}_REVISION_TAG})
     ENDIF()