[core] Fix vector assignment (ray-project#48648)

Signed-off-by: dentiny <[email protected]>

src/ray/common/client_connection.cc

@@ -289,7 +289,6 @@ void ServerConnection::WriteMessageAsync(
   write_buffer->write_cookie = RayConfig::instance().ray_cookie();
   write_buffer->write_type = type;
   write_buffer->write_length = length;
-  write_buffer->write_message.resize(length);
   write_buffer->write_message.assign(message, message + length);
   write_buffer->handler = handler;