Experiment with psycopg2

It's recommended to use psycopg2 instead of the -binary version for production.

https://www.psycopg.org/docs/install.html#psycopg-vs-psycopg-binary

There isn't a great way to do this via poetry. This method works if we accept not having it versioned which is both horrible yet unlikely to break things. An alternative is to define the version twice which is just as bad.