Bump gunicorn from 20.1.0 to 22.0.0 (#319)

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
...

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requirements-deploy.txt

@@ -1,2 +1,2 @@
 connexion[swagger-ui, flask]==2.14.2
-gunicorn==20.1.0
+gunicorn==22.0.0