Set default_authority for all grpc channels.

This ensures tunneled grpc connections can still be routed to the intended host.

weaviate/connect/base.py

@@ -111,6 +111,7 @@ def _grpc_channel(self, proxies: Dict[str, str], grpc_msg_size: Optional[int]) -
         opts = [
             ("grpc.max_send_message_length", grpc_msg_size),
             ("grpc.max_receive_message_length", grpc_msg_size),
+            ("grpc.default_authority", self.grpc.host),
         ]
 
         if (p := proxies.get("grpc")) is not None: