Not supported iris 1.8.6+mc1.21.1

[ZHYxulei]

[Shopper7]

Run the latest build from here (can be acquired via the actions tab).

[JohnGoten]

Seems as if Iris updated once again (twice for a hotfix) and would require yet another update
Decided not to create an issue since this can be applied to 1.8.8 now instead (might want to rename this though)