Bump gunicorn from 20.1.0 to 22.0.0

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-version: 22.0.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

Pipfile

@@ -27,7 +27,7 @@ flask-caching = "==2.0.2"
 flask-debugtoolbar = "==0.11.0"
 flask-moment = "==1.0.2"
 flask-script = "==2.0.6"
-gunicorn = "==20.1.0"
+gunicorn = "==22.0.0"
 icecream = "==2.1.1"
 idna = "==3.3"
 itsdangerous = "==2.0.1"