Fixed broken pnpm/action-setup pin and excluded workspace file from zip

[aileen]

Summary

• Replaced the pnpm/action-setup digest ac6db6d3c1f721f886538a378a2d73e85697340a with 0e279bb959325dab635dd2c09392533439d90093 in both workflow files. The old digest no longer exists upstream (GitHub returns HTTP 422 for it), so any workflow job using it fails to resolve the action. The new digest is the verified SHA behind the current v6/v6.0.8 tag. Discovered during the Changed package manager from yarn to pnpm Themes#529 pnpm migration review.
• Added '!pnpm-workspace.yaml' to the gulp zip task's exclusions. The file is development tooling (pnpm 11 build-script approvals) and does not belong in the installable theme zip.

Verification

• pnpm install --frozen-lockfile succeeds.
• pnpm zip builds dist/tribeca.zip; unzip -l dist/tribeca.zip | grep -i pnpm returns no matches (no pnpm files in the zip, 50 files total).
• Diff is scoped to the two workflow files and gulpfile.js only.

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 133ca574-1e6a-457e-8888-c334350b7890

📥 Commits

Reviewing files that changed from the base of the PR and between 392c29b and 20f8df5.

📒 Files selected for processing (3)

• .github/workflows/deploy-theme.yml
• .github/workflows/test.yml
• gulpfile.js

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix-pnpm-action-pin-and-zip

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