ci: Upgrade to turbo 2.9

[ivov]

Summary

Upgrade to https://turborepo.dev/blog/2-9

Related Linear tickets, Github issues, and Community forum posts

Review / Merge checklist

• I have seen this code, I have run this code, and I take responsibility for this code.
• PR title and summary are descriptive. (conventions)
• Docs updated or follow-up ticket created.
• Tests included.
• PR Labeled with Backport to Beta, Backport to Stable, or Backport to v1 (if the PR is an urgent fix that needs to be backported)

[cubic-dev-ai]

No issues found across 2 files

Architecture diagram

sequenceDiagram
    participant Runner as CI / Developer
    participant Turbo as Turbo CLI (v2.9.x)
    participant Hashing as Hashing Engine
    participant Cache as Cache (Local/Remote)
    participant Workspace as Workspace Package (e.g., n8n-core)

    Note over Runner,Workspace: Turbo Task Execution Flow

    Runner->>Turbo: turbo run build [flags]
    
    Turbo->>Hashing: NEW: Calculate Task Fingerprint (Global + Task Hash)
    Hashing->>Hashing: Process file signatures & ENV vars
    Hashing-->>Turbo: Return Hash Index

    Turbo->>Cache: Request artifact for [Hash Index]
    
    alt Cache Hit (HIT)
        Cache-->>Turbo: Download & Restore Artifacts
        Turbo->>Turbo: Replay cached terminal output
    else Cache Miss (MISS)
        Turbo->>Workspace: CHANGED: Execute task script (npm/yarn/pnpm)
        Workspace->>Workspace: Run build/test/lint
        Workspace-->>Turbo: Exit Code + Stdout/Stderr
        
        opt Task Success
            Turbo->>Turbo: Capture Output Artifacts
            Turbo->>Cache: Upload Artifacts for [Hash Index]
        end
    end

    Note over Turbo: NEW: Generate Terminal Summary (v2.9+)
    Turbo-->>Runner: Final Status & Task Statistics

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[codecov]

Bundle Report

Bundle size has no change ✅

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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