Upgrade to Box 7.4.0

[jbemmel]

See cdgriffith/Box#302

It has a small new feature to allow IP addresses to be used

[ipspace]

Nice job ;) I think the new Box version will be picked up automatically once it's on PyPi. However, we won't be able to use the new IP address feature until we say goodbye to Ubuntu 20.04 and Python 3.8 (waiting a few months for 26.04 to drop ;).