ci: pin node version to 22.20 in test workflow

[chenjiahan]

Summary

Temporary pin Node version to 22.20 as the ut (windows-latest) CI job fails with Node 22.21:

• https://github.com/web-infra-dev/rsbuild/actions/runs/18767609069/job/53545564346
• https://github.com/web-infra-dev/rsbuild/actions/runs/18772235480/job/53558924955
• https://github.com/web-infra-dev/rsbuild/actions/runs/18751006482/job/53490332365
• https://github.com/web-infra-dev/rsbuild/actions/runs/18772660135/job/53560167075

We need to further investigate the root cause of this issue.

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

[netlify]

✅ Deploy Preview for rsbuild ready!

Name	Link
🔨 Latest commit	3091e36
🔍 Latest deploy log	https://app.netlify.com/projects/rsbuild/deploys/68fb42f02a1fa80008925ec0
😎 Deploy Preview	https://deploy-preview-6428--rsbuild.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.
Lighthouse	1 paths audited Performance: 55 (🔴 down 4 from production) Accessibility: 97 (no change from production) Best Practices: 100 (no change from production) SEO: 100 (no change from production) PWA: 60 (no change from production) View the detailed breakdown and full score reports

---

To edit notification comments on pull requests, go to your Netlify project configuration.

[Copilot]

Pull Request Overview

This PR temporarily pins the Node.js version to 22.20 in the CI test workflow to work around failures occurring with Node 22.21 on Windows runners.

Key Changes:

• Node version explicitly set to 22.20 across all test jobs to avoid the 22.21 regression on Windows

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}

[chatgpt-codex-connector]

💡 Codex Review

Here are some automated review suggestions for this pull request.

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review".

If Codex has suggestions, it will comment; otherwise it will react with 👍.

Codex can also answer questions or update the PR. Try commenting "@codex address that feedback".