Update dependency firebase-functions to v6.6.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
firebase-functions	6.3.2 → 6.6.0

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Release Notes

firebase/firebase-functions (firebase-functions)

v6.6.0

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• Add defineJsonSecret API for storing structured JSON objects in Cloud Secret Manager. (#​1745)
• Enhance validation against incomplete/invalid app_remove events to avoid runtime crashes. (#​1738)

v6.5.0

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• Add LLM guidance (#​1736)
• Fix issue calling DataSnapshot methods with null data (#​1661)
• Adds auth.rawToken to context to allow access to the underlying token. (#​1678)
• Fix logger runtime exceptions #(1704)

v6.4.0

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• Add @​deprecated annotation to callable functions's auth policy (#​1675)
• Allows CORS to be a parameter. (#​1688)
• Make traceContext accessible (#​1696)

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