Bump gunicorn from 20.1.0 to 22.0.0 in /lib/chatsecure

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>

lib/chatsecure/requirements.txt

@@ -14,7 +14,7 @@ Flask-Cors==3.0.10
 Flask-RESTful==0.3.9
 Flask-SocketIO==5.3.2
 greenlet==2.0.2
-gunicorn==20.1.0
+gunicorn==22.0.0
 idna==3.7
 importlib-metadata==6.0.0
 iniconfig==2.0.0