ci: bump nginx mainline to 1.31.4

[kjdev]

Summary by CodeRabbit

• Chores
  • Updated the Nginx mainline version used in automated testing to 1.31.4.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Team

Run ID: e00d1003-21b9-4a1d-9948-b1ed9b01c34e

📥 Commits

Reviewing files that changed from the base of the PR and between e1d8ad6 and b408e9a.

📒 Files selected for processing (1)

• .github/workflows/test.yaml

Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review.

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📝 Walkthrough

Walkthrough

The test workflow updates the Nginx mainline matrix entry from version 1.31.3 to 1.31.4.

Changes

Nginx test matrix

Layer / File(s)	Summary
Update mainline test version .github/workflows/test.yaml	The test matrix now uses Nginx 1.31.4 for the mainline configuration.

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

Merge Risk: ⚪ Minimal · up to b408e

This localized CI-only change updates the Nginx mainline version used by the test matrix from 1.31.3 to 1.31.4. No actionable merge-blocking risk remains beyond normal checks and review.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the CI change: updating the Nginx mainline test version from 1.31.3 to 1.31.4.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
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.

Full details: Docstring Coverage

Explanation

No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0 files. (1 skipped: 1 unsupported.)

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch ci/nginx-1.31.4

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