Use binary for psycopg2 from pypi and allow lower rubin_scheduler

[rhiannonlynne]

to pip install lsst-survey-sim in GitHub, the dependency on psycopg2 has to be the binary version.
I'm not sure why we didn't use Psycopg instead (equivalent to psycopg 3) .. but also these dependencies are maybe in some of the wrong places.

I put rubin_scheduler down to the summit value, but I'm not entirely sure that's correct .. it's a thing though that makes it easier to pip install lsst-survey-sim.

[ehneilsen]

We use psycopg2 instead of psycopg(3) because I haven't gone through the code and made the necessary changes for the v3 API.

[ehneilsen]

Yes, I think the dependency here may not be necessary, but I think the install options for rubin_sim in the lsst_survey_sim dependencies will need to be updated if we take the psycopg2 dependency out of schedview.

[rhiannonlynne]

You know - I realized that I was confused; lsst_survey_sim does NOT depend on schedview, so the requirements do not have to match here.
I think I can just close this PR without merging, as unnecessary.