Fix onnx-tf CI: pin pytest<9 for Python 3.8 compatibility

[andife]

Problem

The onnx-tf stable and development Dockerfiles use ubuntu:20.04, which ships with Python 3.8. Since PR #117 bumped the shared requirements_report.txt to pytest>=9.0.3, both jobs have been failing at Docker build time — pytest 9.x dropped Python 3.8 support and is simply not available for it.

ERROR: Could not find a version that satisfies the requirement pytest>=9.0.3
ERROR: No matching distribution found for pytest>=9.0.3

Fix

Instead of using the shared requirements_report.txt in the onnx-tf Dockerfiles, install the three dependencies inline with pytest pinned to >=8.0,<9 (latest: 8.3.5). This keeps the shared requirements file unchanged so all other runtimes (Ubuntu 22.04/24.04, Python 3.10+) are unaffected.

Test plan

• Verify onnx_tf_stable and onnx_tf_dev Docker build steps pass in CI
• Confirm other runtime jobs are unaffected

🤖 Generated with Claude Code

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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