ci: pin PR labeler to allowlisted 1.3.0 commit

[svvarom]

Every "Label PR by type" run fails with startup_failure since #252 merged (e.g. this run). The org's Actions allowlist permits ytanikin/pr-conventional-commits only at b628c5a234cc32513014b7bfdd1e47b532124d98 (1.3.0), but the workflow pins 6ac1cea04190fc076b0e539025501d7e7d241ac1 (1.4.0), so GitHub rejects the workflow before any job starts.

This repins to the allowlisted commit. The only change between 1.3.0 and 1.4.0 is an optional scope-labeling feature we don't use, plus docs — labeling, validation failure on bad titles, and stale-label removal on retitle are identical.

❯ gh api repos/NVIDIA-NeMo/nemo-platform/actions/permissions/selected-actions --jq '.patterns_allowed[] | select(test("ytanikin"))'
ytanikin/pr-conventional-commits@b628c5a234cc32513014b7bfdd1e47b532124d98

Summary by CodeRabbit

• Chores
  • Updated internal PR workflow automation.

This PR contains only infrastructure updates with no user-facing changes.

[coderabbitai]

📝 Walkthrough

Walkthrough

Updated the PR labeling workflow to pin a different revision of the ytanikin/pr-conventional-commits action, changing from v1.4.0 to v1.3.0.

Changes

Workflow action pin update

Layer / File(s)	Summary
PR conventional commits action pin .github/workflows/label-pr.yaml	The ytanikin/pr-conventional-commits action reference is pinned to a new commit revision (v1.3.0 instead of v1.4.0).

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	Title accurately describes the main change: pinning the PR labeler workflow to a specific allowlisted commit version (1.3.0).
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.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch aireinf-208-labeler-allowlist-pin/smuley

---

_{Comment @coderabbitai help to get the list of available commands and usage tips.}

[github-actions]

Suite	Lines Covered	Line Rate	Branch Rate
Unit Tests	19049/25113	75.8%	62.4%
Integration Tests	12058/23885	50.5%	25.7%