Bump gunicorn from 19.9.0 to 22.0.0

Bumps [gunicorn](https://github.com/benoitc/gunicorn) from 19.9.0 to 22.0.0.
- [Release notes](https://github.com/benoitc/gunicorn/releases)
- [Commits](benoitc/gunicorn@19.9.0...22.0.0)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

Pipfile

@@ -13,7 +13,7 @@ flask-marshmallow = "~=0.10.1"
 Flask = "~=2.0.0"
 Flask-Cors = "~=3.0.8"
 Flask-Limiter = "~=3.2.0"
-gunicorn = "~=19.9.0"
+gunicorn = "~=22.0.0"
 sqlalchemy = "~=1.3.13"
 flask-sqlalchemy = "~=2.5.0"
 marshmallow-sqlalchemy = "~=0.23"