Fixes light API for operators with two outputs

[xadupre]

No description provided.

[codecov-commenter]

Codecov Report

Attention: 11 lines in your changes are missing coverage. Please review.

Comparison is base (70d6f64) 81.69% compared to head (b786141) 81.61%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #45      +/-   ##
==========================================
- Coverage   81.69%   81.61%   -0.09%     
==========================================
  Files          45       45              
  Lines        6032     6065      +33     
==========================================
+ Hits         4928     4950      +22     
- Misses       1104     1115      +11     

Files	Coverage Δ
onnx_array_api/__init__.py	100.00% <100.00%> (ø)
onnx_array_api/light_api/_op_var.py	51.42% <100.00%> (ø)
onnx_array_api/light_api/_op_vars.py	44.02% <100.00%> (+0.62%)	⬆️
onnx_array_api/light_api/model.py	81.87% <ø> (ø)
onnx_array_api/light_api/var.py	87.07% <72.50%> (-4.16%)	⬇️

... and 1 file with indirect coverage changes

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