fix(ci): pin action SHAs in security-scan.yml to prevent supply-chain attacks

[tehw0lf]

Summary

• Pins dawidd6/action-download-artifact@v6 and actions/upload-artifact@v4 to full commit SHAs in security-scan.yml, resolving the Semgrep github-actions-mutable-action-tag finding (mutable tags can be silently repointed by the action owner, enabling supply-chain attacks).

Test plan

• CI passes (lint/test/build)
• Semgrep security scan no longer flags github-actions-mutable-action-tag for these two steps

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 9f2bbccd-f94c-4ecb-8681-5f9243c68626

📥 Commits

Reviewing files that changed from the base of the PR and between 1e0c9ed and 1a9006e.

📒 Files selected for processing (1)

• .github/workflows/security-scan.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/pin-action-shas

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