fixing prompt-security's guardrail implementation

[davida-ps]

Relevant issues

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CI (LiteLLM team)

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Type

🆕 New Feature
🐛 Bug Fix
🧹 Refactoring
📖 Documentation
🚄 Infrastructure
✅ Test

Changes

[davida-ps]

@codex review

[chatgpt-codex-connector]

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