python312Packages.insightface: fix passthru.tests

It used to fail with

ModuleNotFoundError: No module named 'mxnet'

+2
+2
pkgs/development/python-modules/insightface/default.nix
··· 7 7 fetchPypi, 8 8 insightface, 9 9 matplotlib, 10 + mxnet, 10 11 numpy, 11 12 onnx, 12 13 onnxruntime, ··· 45 46 albumentations 46 47 easydict 47 48 matplotlib 49 + mxnet # used in insightface/commands/rec_add_mask_param.py 48 50 numpy 49 51 onnx 50 52 onnxruntime