update zimports to 0.4.1

@CaselIT has fixed the "else" issue so we can restore
the black lines here

Change-Id: I06f474daac04b19c3a4a7f122c31c374fef8d4ed

Author: zzzeek

.pre-commit-config.yaml

@@ -7,7 +7,7 @@ repos:
     -   id: black
 
 -   repo: https://github.com/sqlalchemyorg/zimports
-    rev: v0.4.0
+    rev: v0.4.1
     hooks:
     -   id: zimports
         args:

dogpile/cache/backends/memcached.py

@@ -22,8 +22,7 @@
     import memcache
     import pylibmc
     import pymemcache
-
-if not typing.TYPE_CHECKING:
+else:
     # delayed import
     bmemcached = None  # noqa F811
     memcache = None  # noqa F811

dogpile/cache/backends/redis.py

@@ -16,8 +16,7 @@
 
 if typing.TYPE_CHECKING:
     import redis
-
-if not typing.TYPE_CHECKING:
+else:
     # delayed import
     redis = None  # noqa F811