Bug#973033: python-molotov's autopkg tests are failing with python3.9

[Matthias Klose]

Package: src:python-molotov
Version: 1.6-7
Severity: serious
Tags: sid bullseye
User: debian-pyt...@lists.debian.org
Usertags: python3.9

see
https://ci.debian.net/data/autopkgtest/testing/amd64/p/python-molotov/7759352/log.gz