block redis 4.3.2, 4.3.3

Change-Id: If2522b527944c89fdd455a8c3e0428f385150e5c

Author: zzzeek

tox.ini

@@ -39,7 +39,7 @@ deps=
     {memcached}: python-binary-memcached>=0.29.0
     {memcached}: pifpaf>=2.5.0
     {memcached}: pymemcache>=3.5.0
-    {redis}: redis
+    {redis}: redis!=4.3.2,4.3.3
     {redis}: pifpaf
     {redis_sentinel}: redis
     {redis_sentinel}: pifpaf