chore: Block messed up celery release

Author: untitaker

tox.ini

@@ -120,7 +120,8 @@ deps =
     celery-4.1: Celery>=4.1,<4.2
     celery-4.2: Celery>=4.2,<4.3
     celery-4.3: Celery>=4.3,<4.4
-    celery-4.4: Celery>=4.4,<4.5
+    # https://github.com/celery/celery/issues/6153
+    celery-4.4: Celery>=4.4,<4.5,!=4.4.4
 
     requests: requests>=2.0