Bump psycopg2 from 2.8.4 to 2.8.6 in /requirements/base
Bump psycopg2 from 2.8.4 to 2.8.6 in /requirements/base

Bumps [psycopg2](https://github.com/psycopg/psycopg2) from 2.8.4 to 2.8.6.
- [Release notes](https://github.com/psycopg/psycopg2/releases)
- [Changelog](https://github.com/psycopg/psycopg2/blob/master/NEWS)
- [Commits](https://github.com/psycopg/psycopg2/commits)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
studentenportal/web,studentenportal/web,studentenportal/web,studentenportal/web,studentenportal/web