Unpinning onnxruntime==0.15.1

[mshr-h]

#736
#737
Seems like the issue was fixed on 0.16.1.

[mshr-h]

This is the fix commit.
microsoft/onnxruntime@1c245e6

[codecov-commenter]

Codecov Report

Merging #738 (3127aae) into main (d9470ef) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #738   +/-   ##
=======================================
  Coverage   90.20%   90.20%           
=======================================
  Files          80       80           
  Lines        4676     4676           
  Branches      856      856           
=======================================
  Hits         4218     4218           
  Misses        260      260           
  Partials      198      198           

Flag	Coverage Δ
unittests	90.20% <ø> (ø)

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[ksaur]

Thanks for the follow-up!