Bump gunicorn in /examples/server/wsgi/django_socketio

Bumps [gunicorn](https://github.com/benoitc/gunicorn) from 20.1.0 to 22.0.0.
- [Release notes](https://github.com/benoitc/gunicorn/releases)
- [Commits](benoitc/gunicorn@20.1.0...22.0.0)

---
updated-dependencies:
- dependency-name: gunicorn
  dependency-type: direct:production
...

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

examples/server/wsgi/django_socketio/requirements.txt

@@ -1,7 +1,7 @@
 asgiref==3.6.0
 bidict==0.22.1
 Django==4.2.11
-gunicorn==20.1.0
+gunicorn==22.0.0
 h11==0.14.0
 python-engineio
 python-socketio