change: bump onnx version to >=1.15.0

[benieric]

Issue #, if available:

Description of changes:

Testing done:

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.38%. Comparing base (327638e) to head (40a8cd4).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4514   +/-   ##
=======================================
  Coverage   87.38%   87.38%           
=======================================
  Files         389      389           
  Lines       36776    36776           
=======================================
  Hits        32135    32135           
  Misses       4641     4641           

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[mufaddal-rohawala]

AWS CodeBuild CI Report

• CodeBuild project: sagemaker-python-sdk-pr
• Commit ID: d9c7968
• Result: FAILED
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[benieric]

/bot run pr

[mufaddal-rohawala]

AWS CodeBuild CI Report

• CodeBuild project: sagemaker-python-sdk-pr
• Commit ID: d9c7968
• Result: FAILED
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[mufaddal-rohawala]

AWS CodeBuild CI Report

• CodeBuild project: sagemaker-python-sdk-pr
• Commit ID: ec789ef
• Result: FAILED
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[mufaddal-rohawala]

AWS CodeBuild CI Report

• CodeBuild project: sagemaker-python-sdk-pr
• Commit ID: 40a8cd4
• Result: SUCCEEDED
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