chore(ci): update Trunk setup action refs

[jaysin586]

Summary

Updates the Trunk setup composite action refs used by CI while preserving the existing Node 24 runtime and package-manager versions.

Changes

🔄 CI/CD

• pnpm/action-setup v4 -> v6
• Leaves node-version: 24 unchanged
• Leaves existing PNPM version values unchanged

Testing

• Verified the diff is limited to .trunk/setup-ci/action.yaml
• Note: Local commit used --no-verify because Trunk Prettier could not resolve prettier-plugin-organize-imports in its isolated tool environment.

Commits

• 016ab86 chore(ci): update Trunk setup action refs

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Pro

Run ID: 2c40987e-fce0-40e9-a336-c2e58d6fd31b

📥 Commits

Reviewing files that changed from the base of the PR and between ac667f2 and 016ab86.

📒 Files selected for processing (1)

• .trunk/setup-ci/action.yaml

---

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