fix(deps): update dependency firebase-tools to v9

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
firebase-tools	^8.20.0 -> ^9.1.1

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Release Notes

firebase/firebase-tools

v9.1.1

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• Allows more than 100 concurrent connections to the Realtime Database emulator.
• Fixes incorrect databaseURL inside the Cloud Functions emulator for new projects (#​2965).
• Fixes function URLs when emulating namespaced/grouped Cloud Functions (#​2966).
• Supports using firebase-bolt installed in local node_modules (#​767).
• Fixes issue where Auth triggers were not disabled when background trigges were disabled.
• Re-adds support for proxying HTTP requests in a new underlying library (#​2927).
• Updates the Cloud Functions for Firebase templates used in initialization (#​2919).

v9.1.0

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• Improves error handling for firestore:delete when deleting very large documents.
• Support batchCreate API in Auth Emulator (#​2947).
• Support emulators:export and import for Auth Emulator (#​2955).
• Fixes issue with firebase init database populating wrong key for database.rules.
• Fixes Emulator UI failing to load Firestore listening on 0.0.0.0.

v9.0.1

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• Fixes "checkForNode8 is not a function" issue in firebase deploy (#​2944).

v9.0.0

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• Breaking: Drops support for Node.js 8.
• Breaking: Disables deploys of the deprecated Node.js 8 runtime for Cloud Functions. Existing Node.js 8 functions will stop executing on 2021-03-15.
• Updates several dependencies that require Node.js >= 10 to fix npm audit issues.

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