ci(workflows): pin GitHub Actions dependencies to commit SHAs

[gkorland]

Summary

Pin all third-party GitHub Actions to their full commit SHA for supply-chain security.

Changes

• Pin 17 action references across 4 workflow files to commit SHAs
• Version tags preserved in comments for readability

Changed Files

• .github/workflows/build.yml
• .github/workflows/playwright.yml
• .github/workflows/pypi-publish.yml
• .github/workflows/release-image.yml

Testing

• Workflow syntax is unchanged; only the @ref portion of uses: directives is modified
• All pinned SHAs correspond to the exact same code as the original version tags

Memory / Performance Impact

N/A - CI configuration only.

Related Issues

Closes #634

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 2291624a-40a5-444e-94c3-98e5388531f2

📥 Commits

Reviewing files that changed from the base of the PR and between 7aa40c6 and ada8862.

📒 Files selected for processing (4)

• .github/workflows/build.yml
• .github/workflows/playwright.yml
• .github/workflows/pypi-publish.yml
• .github/workflows/release-image.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/pin-workflow-deps

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