fix type hint (#2963)

Co-authored-by: d184230 <dubkov.a@skbkontur.ru>

redis/client.py

@@ -94,7 +94,7 @@ class Redis(RedisModuleCommands, CoreCommands, SentinelCommands):
     """
 
     @classmethod
-    def from_url(cls, url: str, **kwargs) -> None:
+    def from_url(cls, url: str, **kwargs) -> "Redis":
         """
         Return a Redis client object configured from the given URL