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 2 action references across 1 workflow files to commit SHAs
• Version tags preserved in comments for readability

Changed Files

• .github/workflows/spellcheck.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 #400

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 1f5afdd0-d7d5-4f27-938f-a10a2f1414a9

📥 Commits

Reviewing files that changed from the base of the PR and between df21552 and 7bf151b.

📒 Files selected for processing (1)

• .github/workflows/spellcheck.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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