When pip is upgraded to 20.3, the pip dependency resolver is much more
strict and will no longer install a combination of packages that is mutually
These changes account for the fact that Shipyard imports Armada, Drydock,
Promenade, and Deckhand. Having said that, with pip 20.3, the pip
packages amongst those projects cannot conflict. A follow-up change may
be needed if more conflicts are found.