pgAdmin requires psycopg2-2.8 [15703]

[tony-landreth]

Checklist:

• [x] Have you added an explanation of what your changes do and why you'd like them to be included?
• [ ] Have you updated or added documentation for the change, as applicable?
• [x] Have you tested your changes on all related environments with successful results, as applicable?

Type of Changes:

• [x] 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)

What is the current behavior? (link to any open issues here)

Users presently can't use pgAdmin and the UI complains about psycopg2.

What is the new behavior (if this is a feature change)?

This is just a fix, so the expected behavior is restored.

Other information: