chore(deps): bump gunicorn from 20.1.0 to 22.0.0 in /src

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>

src/requirements.txt

@@ -3,7 +3,7 @@ flask==2.2.5
 Flask-Cors==3.0.10 
 
 # Server.
-gunicorn==20.1.0
+gunicorn==22.0.0
 
 # Utils.
 hashids==1.3.1