chore: set lb to false for testnet

Author: achilleas-kal

pyinjective/async_client.py

@@ -96,6 +96,10 @@ def __init__(
         self.cookie_type = None
         self.expiration_format = None
         self.load_balancer = load_balancer
+        self.network = network
+
+        if self.network.string() == "testnet":
+            self.load_balancer = False
 
         if self.load_balancer is False:
             self.cookie_type = "grpc-cookie"