Where can I get the latest version as a flatpak?

The latest flatpak is 5.0.133

All the official releases are here:

There’s no flatpak, but there’s AppImage.
The flatpak feature request received 4 votes in three years, so it was not adopted.
That being said, v132 is pretty recent, so somebody flatpacked it recently, but I don’t know who. GDevelop is open source, so anyone can do it.