[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

t/unit/backends/test_redis.py

@@ -8,7 +8,7 @@
 from sys import platform
 
 if platform == 'darwin':
-    from socket import TCP_KEEPCNT, TCP_KEEPALIVE, TCP_KEEPINTVL
+    from socket import TCP_KEEPALIVE, TCP_KEEPCNT, TCP_KEEPINTVL
 else:
     from socket import TCP_KEEPCNT, TCP_KEEPIDLE, TCP_KEEPINTVL
 
@@ -24,6 +24,7 @@
 from celery.utils.collections import AttributeDict
 from t.unit import conftest
 
+
 def raise_on_second_call(mock, exc, *retval):
     def on_first_call(*args, **kwargs):
         mock.side_effect = exc