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-type: direct:production
...

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

Author: dependabot[bot]

requirements.txt

@@ -2,7 +2,7 @@ asgiref==3.5.0
 backports.zoneinfo==0.2.1;python_version<"3.9"
 dj-database-url==0.5.0
 Django==4.0.3
-gunicorn==20.1.0
+gunicorn==22.0.0
 psycopg2-binary==2.9.3
 sqlparse==0.4.2
 whitenoise==6.0.0