Bug#913452: vtk-dicom has a hard-coded dependency on python (< 3.7)

[Matthias Klose]

Package: src:vtk-dicom
Version: 0.8.7-2
Severity: serious
Tags: sid buster

vtk-dicom has a hard-coded dependency on python (< 3.7), which will make the
package RC with the move to Python 3.7.  Please update the package.