Pin the ONNX IR version in the RHEL tutorial's verification model

[nv-rinig]

Step 4 generates its ONNX test model with an unpinned pip install onnx; make_model stamps the library's newest IR version. onnx 1.23.0 (2026-09-18) moved that default to IR 14, which the tutorial's ONNX Runtime rejects ("Unsupported model IR version: 14, max supported IR version: 13"). Pin ir_version=7, the IR that opset 13 shipped with. Verified: the pinned model passes onnx.checker and serves [11, 22, 33, 44] in ONNX Runtime.

[greptile-apps]

Confidence Score: 5/5

The PR appears safe to merge, with no actionable correctness, security, or repository-rule issues identified.

Summary

Pins the generated verification model to ONNX IR version 7 while retaining opset 13.

• Prevents newer ONNX releases from emitting an IR version unsupported by the tutorial's runtime.
• Keeps the generated Add model compatible with the consuming ONNX Runtime backend.

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