Update other pip packages

[fabm3n]

Currently, with the command provided by the docs, only the parsedmarc package is updated.
Wouldn't it be better to use a pip update strategy to update all the other packages?
For example, instead of
sudo -u parsedmarc /opt/parsedmarc/venv/bin/pip install -U parsedmarc

it could be
sudo -u parsedmarc /opt/parsedmarc/venv/bin/pip install -U --upgrade-strategy eager parsedmarc

This would ensure that everyone is using the latest libs with the latest security and bugs fixed.