Fix for Godot 4 has been released.

I know it's been a while since someone has made a fork dedicated to fixing g-rcp2 for Godot 4, but I had no focus on doing an official fix due to my schedules.

Here's the link, thanks to raghid for the conversion since I can't fully run the latest version of Godot:

https://github.com/jreo03/g-rcp2/tree/godot-4.0.3-conversion