Update Assimp: issues with master from 05-25-2021 :

[nmellado]

With assimp master from 05-25-2021 :
Radium compiles fine but there is huge problems when loading animations :

• from dae files : no binding from skeleton to meshes,
• from fbx files : wrong matrices and time settings.

The first thing to do is to verify our transformations from assimp data to Radium data is correct, if so, understand what is incorrect on the assimp side and open a issue on assimp about that. But note that as the issues
assimp/assimp#3576
assimp/assimp#3477
assimp/assimp#3468
that might solve part of the problem are still opened, perhaps our problem will be fixed soon.

Originally posted by @MathiasPaulin in #647 (comment)