For testing with Python 3.9, it!d be better to use the version which provides binary wheels for 3.9.

For more details, see https://github.com/psycopg/psycopg2/issues/674

Bumps [gunicorn](https://github.com/benoitc/gunicorn) from 19.4.5 to 19.5.0.
- [Release notes](https://github.com/benoitc/gunicorn/releases)
- [Commits](https://github.com/benoitc/gunicorn/compare/19.4.5...19.5.0)

Signed-off-by: dependabot[bot] <support@github.com>

TypeError at /
process() missing 1 required positional argument: 'stream'

Related to https://github.com/jazzband/django-debug-toolbar/issues/856

The current required Django version is 1.9.5 which doesn't support
Python 3.3 which causes the Python 3.3 deployment to fail while
using django-ex git repo.

The Django version is modified to use 1.8.x only to include Python
3.3 support.

Signed-off-by: Vu Dinh <vdinh@redhat.com>