chore(deps): update dependency firebase-tools to v8.20.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
firebase-tools	8.17.0 -> 8.20.0

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Release Notes

firebase/firebase-tools

v8.20.0

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• Shows missing documents in Emulator UI Firestore viewer.
• Better supports paths with special characters in Emulator UI Firestore viewer.
• Fixes generating email link from Admin SDK failing with Auth Emulator (#​2933).
• Fixes issue where multiple set-cookie headers were being proxied incorrectly in proxied responses through the Firebase Hosting emulator (#​2931).

v8.19.0

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• Adds Node.js 14 (Beta) runtime support to Cloud Functions for Firebase.

v8.18.1

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• Fixes issue where emulated functions were not receiving all expected headers.

v8.18.0

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• Adds i18n rewrites to the Firebase Hosting emulator.
• Changes Auth Emulator IDP sign-in to always return an access token.
• Adds new Cloud Functions regions and new versions of firebase-functions and firebase-admin to ext:dev:init templates.
• Fixes unclear error messages when trying to enable APIs that require billing on projects without a billing account.
• Adds support for specifying the service account a Cloud Function should run as, by setting the serviceAccount in functions.runWith().
• Fixes Firestore Emulator listCollectionId not returning collections with nested docs.
• Fixes Firestore Emulator listDocuments with showMissing returning 500 errors.
• Adds additional logging when deploying to a Firebase Hosting preview channel.

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