Bug#912647: pyatspi has a hardcoded upper dependency python3 (<< 3.7)

[Matthias Klose]

Package: src:pyatspi
Version: 2.30.0+dfsg-1
Severity: serious
Tags: sid buster

pyatspi has a hardcoded upper dependency python3 (<< 3.7), needs to be changed
for the upcoming Python3 transition.