Added support for 4.1

[OctavoPE]

This change actually continues rig support for previous versions of Blender/Goo as well. A note is made that the new shader only supports 4.1 anyway.

[michael-gh1]

👍 Approved, but also had a question

[OctavoPE]

Check this out, this is why we needed the change. https://projects.blender.org/blender/blender/issues/124891
Our original loop loops through the collection as we're actively removing from it. The blender developer that responded confirmed that was unintended behavior. In previous version of Blender, we got away with it scot-free, but with 4.1 it crashes. As they pointed out, a .clear() method is ideal but we don't have that yet lmao. The solution was this response here: https://projects.blender.org/blender/blender/issues/124891#issuecomment-1245473
Not sure why the OP fought with the Blender dev after he got his fix but yeah lol.