chore(build): guard gitleaks license and pin action SHA

[sklarsa]

Summary

• skip the gitleaks action when GITLEAKS_LICENSE is unavailable
• pin gitleaks/gitleaks-action to commit 83d9cd684c87d95d656c1458ef04895a7f1cbd8e

Why

Public forks do not have access to GITLEAKS_LICENSE, so the workflow should skip that step instead of failing on forked pull requests.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: b8bfee16-ad45-42a8-a521-3fd12406cb87

📥 Commits

Reviewing files that changed from the base of the PR and between e80d250 and 1c7e663.

📒 Files selected for processing (1)

• .github/workflows/gitleaks.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch sklarsa/gitleaks-license-guard-20260420180932

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