chore(deps): update devdependency firebase-functions to v7

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
firebase-functions	^6.5.0 -> ^7.0.0

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Release Notes

firebase/firebase-functions (firebase-functions)

v7.0.0

Compare Source

• BREAKING: Drop support for Node.js 16. Minimum supported version is now Node.js 18. (#​1747)
• BREAKING: Remove deprecated functions.config() API. Use params module for environment variables instead. (#​1748)
• BREAKING: Upgrade to TypeScript v5 and target ES2022. (#​1746)
• BREAKING: Unhandled errors in async onRequest handlers in the Emulator now return a 500 error immediately. (#​1755)
• Add support for ESM (ECMAScript Modules) alongside CommonJS. (#​1750)
• Add onMutationExecuted() trigger for Firebase Data Connect. (#​1727)
• BREAKING: Rename v1 Event to LegacyEvent to avoid api-extractor conflict. (#​1767)

v6.6.0

Compare Source

• 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)

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