chore(deps): update actions/setup-node action to v6

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
actions/setup-node	action	major	v4 → v6

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Release Notes

actions/setup-node (actions/setup-node)

v6

Compare Source

v5

Compare Source

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Configuration

📅 Schedule: Branch creation - "on the 15th day of the month before 12pm" in timezone UTC, Automerge - At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

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• If you want to rebase/retry this PR, check this box

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This PR was generated by Mend Renovate. View the repository job log.

[greptile-apps]

Greptile Overview

Greptile Summary

Updated actions/setup-node from v4 to v6 in the Coana Guardrail workflow to use the latest version of the GitHub Action.

• The change only affects the version tag of the action, no configuration changes required
• The workflow continues to use Node.js 20.x as specified
• No breaking changes expected as the action interface remains compatible

Confidence Score: 5/5

• This PR is safe to merge with minimal risk
• This is a straightforward dependency update of a GitHub Action with no breaking changes in the configuration. The action continues to use the same parameters (node-version: 20.x) and the workflow logic remains unchanged. The update from v4 to v6 is a routine maintenance task that brings the latest improvements and security patches from the GitHub Actions team.
• No files require special attention

Important Files Changed

Filename	Overview
.github/workflows/coana-guardrail.yml	Updated actions/setup-node from v4 to v6, no configuration changes needed

Sequence Diagram

sequenceDiagram
    participant PR as Pull Request
    participant GHA as GitHub Actions
    participant Checkout as actions/checkout@v4
    participant SetupNode as actions/setup-node@v6
    participant Coana as Coana CLI
    
    PR->>GHA: Trigger workflow
    GHA->>Checkout: Checkout base branch
    Checkout-->>GHA: Base branch ready
    GHA->>GHA: Fetch PR branch
    GHA->>GHA: Get changed files
    GHA->>SetupNode: Setup Node.js 20.x
    Note over SetupNode: Updated from v4 to v6
    SetupNode-->>GHA: Node.js environment ready
    GHA->>Coana: Run Coana on base branch
    Coana-->>GHA: Analysis complete
    GHA->>GHA: Reset file permissions
    GHA->>Checkout: Checkout current branch
    Checkout-->>GHA: Current branch ready
    GHA->>Coana: Run Coana on current branch
    Coana-->>GHA: Analysis complete
    GHA->>Coana: Compare reports
    Coana-->>PR: Post comparison results

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