Fix broken connection string

Signed-off-by: Willem Pienaar <[email protected]>

sdk/python/tests/test_cli_redis.py

@@ -34,7 +34,7 @@ def test_basic() -> None:
             type: bigquery
         online_store:
             redis_type: redis
-            redis_connection_string: localhost:6379,db=0
+            connection_string: localhost:6379,db=0
         """
             )
         )