🛡️ Sentinel: Update actions/first-interaction to latest commit

[google-labs-jules]

• 💡 Vulnerability: The actions/first-interaction GitHub Action was pinned to an outdated commit (fb24026...), potentially missing years of security patches and bug fixes.
• 🎯 Impact: Using outdated actions can expose the CI/CD pipeline to known and fixed vulnerabilities, increasing the repository's attack surface.
• 🔧 Fix: Updated the uses clause in the greetings.yml workflow to point to the latest stable commit hash (1c46889) corresponding to version v3.1.0.
• ✅ Verification: The change was verified by confirming the new commit hash corresponds to the correct version and by passing a code review.

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PR created automatically by Jules for task 4222248380312016936 started by @sbusanelli

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