Bumps [gunicorn](https://github.com/benoitc/gunicorn) from 20.0.3 to 20.0.4. - [Release notes](https://github.com/benoitc/gunicorn/releases) - [Commits](https://github.com/benoitc/gunicorn/compare/20.0.3...20.0.4) Signed-off-by: dependabot-preview[bot] <support@dependabot.com>