[None][fix] Pin distro for CI sysinfo detection

[chzblych]

Description

openai 3.3.1 removed distro from its dependency list. TensorRT-LLM's CI sysinfo probe imports distro to populate linux_distribution_name, which is used by test-db rendering. Because TensorRT-LLM did not declare that dependency directly, newly resolved development environments can report na and render empty L0 test lists.

Add distro==1.9.0 directly to requirements-dev.txt. This is a deliberately minimal hotfix to restore the dependency contract. The stdlib fallback and render-time diagnostics remain in follow-up #17993 and should be rebased after this change lands.

Functional impact is limited to development and CI environments. distro 1.9.0 was previously installed transitively, has no dependencies, and is licensed under Apache-2.0.

Test Coverage

• git diff --check
• Parsed distro==1.9.0 with packaging.requirements.Requirement
• python3 -m pip install --dry-run --no-deps distro==1.9.0 resolved to distro-1.9.0
• Full L0 not run for this minimal main-breaking hotfix; follow-up [None][fix] Keep sysinfo distro probe working without the distro module; fail empty test-list renders loudly #17993 will validate the fallback and diagnostic changes end to end

PR Checklist

• PR description explains the change and its risk.
• Change follows the TensorRT-LLM coding guidelines.
• Dependency metadata reviewed: Apache-2.0, no dependencies, and no vulnerabilities listed by PyPI.
• No API, ownership, architecture, or documentation change is required.

Dev Engineer Review

• Added distro==1.9.0 to requirements-dev.txt.
• The dependency pin is valid and limited to development and CI environments.
• The change restores distro availability for CI sysinfo detection.
• Validation included whitespace checks, requirement parsing, and a pip dry run.
• No code, API, performance, or error-handling changes were made.

QA Engineer Review

No test changes.

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• requirements-dev.txt

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Walkthrough

The development requirements add the pinned distro==1.9.0 dependency.

Changes

Development dependency update

Layer / File(s)	Summary
Pin distro development dependency requirements-dev.txt	Adds distro==1.9.0 to the development requirements.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Merge Risk: ⚪ Minimal · up to e216a

This change restores the declared CI development dependency with no expected product-runtime impact, and no actionable merge-blocking risk remains after normal review.

Possibly related PRs

• NVIDIA/TensorRT-LLM#18003: Adds the same pinned development dependency.
• NVIDIA/TensorRT-LLM#17993: Adds the same distro development dependency.

Suggested reviewers: schetlur-nv

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title follows the required format and clearly summarizes the direct dependency pin for CI sysinfo detection.
Description check	✅ Passed	The description explains the issue, solution, impact, validation, and checklist items with sufficient detail.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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• Create PR with unit tests

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