fix: prevent regex catastrophic backtracking in forwarded message pattern

[athreya-splunk]

Bug Fixes

prevent regex catastrophic backtracking in forwarded message pattern

Manual Documentation

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• New, updated, or removed REST handlers
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• I have verified that manual documentation has been updated where appropriate

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[splunk-soar-semantic-release]

🎉 This PR is included in version 3.4.8 🎉

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