Bump gunicorn from 21.2.0 to 22.0.0

Bumps [gunicorn](https://github.com/benoitc/gunicorn) from 21.2.0 to 22.0.0.
- [Release notes](https://github.com/benoitc/gunicorn/releases)
- [Commits](benoitc/gunicorn@21.2.0...22.0.0)

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

Signed-off-by: dependabot[bot] <support@github.com>

pyproject.toml

@@ -20,7 +20,7 @@ jsonschema = "^3.1"
 bootstrap-flask = "^2.2"
 flask-admin = "^1.6.0"
 backoff = "^1.10.0"
-gunicorn = {version = "^21.2", optional = true}
+gunicorn = {version = "^22.0", optional = true}
 psycopg2-binary = {version = "^2.9", optional = true}
 email-validator = "^1.1"
 flask-cors = "^3.0.10"