chore: Update action setup to v5

[emincihangeri]

Context

Closes SAP/ai-sdk-js-backlog#526.

What this PR does and why it is needed

[hyperspace-insights]

Summary

The following content is AI-generated and provides a summary of the pull request:

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Update pnpm/action-setup to v6 in CI Setup Action

🔧 Chore: Updated the pnpm/action-setup GitHub Action from v4 to v6 in the reusable setup action configuration.

Changes

• .github/actions/setup/action.yml: Bumped pnpm/action-setup from v4 to v6 to align with the latest version of the action, keeping it consistent with the other actions in the workflow (actions/checkout@v6, actions/setup-node@v6).

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• 🔄 Regenerate and Update Summary
• ✏️ Insert as PR Description (deletes this comment)
• 🗑️ Delete comment

PR Bot Information

Version: 1.19.15 | 📖 Documentation | 🚨 Create Incident | 💬 Feedback

• GithubContextProvider: chore(deps-dev): Bump @sap/cds-dk from 8.6.1 to 8.7.1 #526
• Output Template: Default Template
• Event Trigger: pull_request.opened
• Correlation ID: c2db18c0-2dc2-11f1-85b9-7c55a095d730
• Summary Prompt: Default Prompt
• LLM: anthropic--claude-4.6-sonnet
• File Content Strategy: Full file content

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