Upgrade gunicorn: 19 → 21

dbrgn · dbrgn · commit 413c83a4f5ab · 2023-11-08T00:16:57.000+01:00
diff --git a/requirements.txt b/requirements.txt
@@ -29,4 +29,4 @@ model-mommy~=2.0.0
 freezegun~=1.2.2
 
 # Deployment
-gunicorn>=19,<20
+gunicorn>=21,<22
