Make Python 3.7 the minimum version
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python3is version 3.7 on current stable Debian (10, "Buster"). https://packages.debian.org/buster/python3 -
python3is version 3.8 on current Ubuntu LTS (20.04, "Focal"). https://packages.ubuntu.com/focal/python3 - The GitLab CI file use explicitely Python 3.7.
De facto, we don't use 3.5 anymore, so we do not test on it. In consequence, we already don't support it anymore.