Usage of psycopg2-binary in auth-libs is an antipattern

[spwoodcock]

• login/backend/pyproject.toml

  Line 16 in 95910ee

  "psycopg2-binary>=2.9.0",

• psycopg2-binary is never recommended for production. I think we have a bunch of tools that are still using psycopg2 (which should be updated use the psycopg package, but that's another point). If they need the lib, it should be the psycopg2 package installed in prod, not the binary one.

[spwoodcock]

Ah didn't realise this isn't in the auth-lib, but in the backend pyproject.toml!

So not as much of a big deal, but should still be replaced 👍