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>

requirements.txt

@@ -17,7 +17,7 @@ Django==4.1.13
 django-cors-headers==3.13.0
 drf-yasg==1.21.5
 flake8==5.0.4
-gunicorn==20.1.0
+gunicorn==22.0.0
 html5lib==1.1
 idna==3.4
 inflection==0.5.1