Merge branch '4.4'

* 4.4:
  Redis 4.3 is required

Author: javiereguiluz

messenger.rst

@@ -864,7 +864,7 @@ The Redis transport uses `streams`_ to queue messages.
     # .env
     MESSENGER_TRANSPORT_DSN=redis://localhost:6379/messages
 
-To use the Redis transport, you will need the Redis PHP extension (^4.2) and
+To use the Redis transport, you will need the Redis PHP extension (^4.3) and
 a running Redis server (^5.0).
 
 .. caution::