Fix C++20 allocator construct deprecation (ros2#2292)

Signed-off-by: Guilherme Rodrigues <[email protected]>

Author: AiVerisimilitude

rclcpp/include/rclcpp/experimental/intra_process_manager.hpp

@@ -488,8 +488,8 @@ class IntraProcessManager
 
       if constexpr (rclcpp::TypeAdapter<MessageT>::is_specialized::value) {
         ROSMessageTypeAllocator ros_message_alloc(allocator);
-        auto ptr = ros_message_alloc.allocate(1);
-        ros_message_alloc.construct(ptr);
+        auto ptr = ROSMessageTypeAllocatorTraits::allocate(ros_message_alloc, 1);
+        ROSMessageTypeAllocatorTraits::construct(ros_message_alloc, ptr);
         ROSMessageTypeDeleter deleter;
         allocator::set_allocator_for_deleter(&deleter, &allocator);
         rclcpp::TypeAdapter<MessageT>::convert_to_ros_message(*message, *ptr);