Merge topic 'update-version-number'

6c551860 Update version number to 9.0.0

Acked-by: Kitware Robot <kwrobot@kitware.com>
Acked-by: David E. DeMarle <dave.demarle@kitware.com>
Merge-request: !6503

CMake/vtkVersion.cmake

 # VTK version number components.
-set(VTK_MAJOR_VERSION 8)
-set(VTK_MINOR_VERSION 90)
+set(VTK_MAJOR_VERSION 9)
+set(VTK_MINOR_VERSION 0)
 set(VTK_BUILD_VERSION 0)
 
 if (NOT VTK_MINOR_VERSION LESS 100)