Upgrade gunicorn to latest 22.0.0 version

GHSA-w3h3-4rj7-4ph4
Signed-off-by: tdruez <tdruez@nexb.com>

Author: tdruez

setup.cfg

@@ -68,7 +68,7 @@ install_requires =
     django-rq==2.10.2
     redis==5.0.3
     # WSGI server
-    gunicorn==21.2.0
+    gunicorn==22.0.0
     # Docker
     container-inspector==32.0.1
     # ScanCode-toolkit