build(deps): bump gunicorn from 20.0.4 to 22.0.0

Bumps [gunicorn](https://github.com/benoitc/gunicorn) from 20.0.4 to 22.0.0.
- [Release notes](https://github.com/benoitc/gunicorn/releases)
- [Commits](benoitc/gunicorn@20.0.4...22.0.0)

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

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

requirements.txt

@@ -19,7 +19,7 @@ django-phonenumber-field==4.0.0
 django-simple-history==3.0.0
 django-storages==1.9.1
 docutils==0.15.2
-gunicorn==20.0.4
+gunicorn==22.0.0
 idna==2.10		# requests
 ipython==8.10.0
 ipython-genutils==0.2.0