Replace psycopg2 with psycopg

[pamella]

Description

Replace psycopg2 with psycopg due to Django support recommendation.

Motivation and Context

Resolves #661

Screenshots (if appropriate):

Steps to reproduce (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires documentation updates.
• I have updated the documentation accordingly.
• My change requires dependencies updates.
• I have updated the dependencies accordingly.