Explicitly install psycopg2 in Django test
Explicitly install psycopg2 in Django test

The django-cockroachdb adapter was recently changed to require psycopg2
to be installed explicitly.

cockroachdb/examples-orms,cockroachdb/examples-orms,cockroachdb/examples-orms,cockroachdb/examples-orms,cockroachdb/examples-orms,cockroachdb/examples-orms,cockroachdb/examples-orms