Nagi

Fix port cache calculation in GraphNode

2

Fixes #91082 by updating the `left_port_cache` & `right_port_cache` calculation in `GraphNode::_port_pos_update`.

### Tested versions - Reproducible in v4.3.dev.custom_build [c7f56d3], v4.2.2.stable.official [15073afe3] ### System information Godot v4.3.dev (c7f56d3) - Pop!_OS 22.04 LTS - X11 - Vulkan (Forward+) - dedicated NVIDIA GeForce GTX...