Upgrade gunicorn: 19 → 21

dbrgn · dbrgn · commit 8a93762854cb · 2023-11-08T00:17:09.000+01:00
diff --git a/requirements.txt b/requirements.txt
@@ -29,4 +29,4 @@ model-mommy>=1.6,<1.7
 freezegun>=0.3.9,<0.4
 
 # Deployment
-gunicorn>=19,<20
+gunicorn>=21,<22
