chore: bump happy-dom to a patched release

[sorenbs]

Summary

• bump happy-dom from 20.7.0 to 20.8.9
• refresh the lockfile for the patched release
• keep the existing Vitest UI environment intact

Context

happy-dom is a dev dependency only in this repository. It is used by the Vitest ui project as the DOM test environment and is not shipped in the published runtime package.

Closes #1472

[sorenbs]

@coderabbitai full review

[coderabbitai]

✅ Action performed

Full review finished.

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No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: e3c67b72-945c-46cc-9a45-b8079bfac3a8

📥 Commits

Reviewing files that changed from the base of the PR and between b10686a and dd4c7ed.

⛔ Files ignored due to path filters (1)

• pnpm-lock.yaml is excluded by !**/pnpm-lock.yaml

📒 Files selected for processing (1)

• package.json

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Summary by CodeRabbit

• Chores
  • Updated the development environment’s DOM simulation tooling to a newer version.
  • No user-facing functionality or behavior changes.

Walkthrough

Updated the happy-dom development dependency in package.json from version 20.7.0 to 20.8.9. No other package metadata or scripts were changed.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	It clearly states the main change: bumping happy-dom to a patched release.
Description check	✅ Passed	It describes the happy-dom bump, lockfile refresh, and unchanged Vitest UI environment.
Linked Issues check	✅ Passed	Updating happy-dom to 20.8.9 matches the linked vulnerability-fix objective.
Out of Scope Changes check	✅ Passed	The diff shows only the happy-dom dependency bump, with no unrelated changes.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/fix-happy-dom-vulnerability

✨ Simplify code

• Create PR with simplified code
• Commit simplified code in branch codex/fix-happy-dom-vulnerability

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