[BUGFIX]: argilla server: install default psycopg2 driver used by alembic

[frascuchon]

Description

Alembic will use psycopy2 driver by default. We still need to install it to avoid startup errors.

Type of change

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested

Checklist

• I added relevant documentation
• I followed the style guidelines of this project
• I did a self-review of my code
• I made corresponding changes to the documentation
• I confirm My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• I have added relevant notes to the CHANGELOG.md file (See https://keepachangelog.com/)

[frascuchon]

Tested is working on the dev environment

[jfcalvo]

@frascuchon looks like psycopg aka psycopg 3 is the way to go (instead of psycopg2). It's a modern rewritten of the original psycopg2. In fact looks like all benchmarks shows that it it fast: https://www.timescale.com/blog/psycopg2-vs-psycopg3-performance-benchmark/

[frascuchon]

Yes. But that means changing all the default and env vars when using PostgreSQL. If no driver is defined in the SQLAlchemy database UR when using PostgreSQL, psycopg2 will be used by default, falling into a missing package error. I created this fix to avoid reverting all the dependencies upgrades included on the PR #5649