Bump firebase-admin from 8.8.0 to 8.9.0

[dependabot-preview]

Bumps firebase-admin from 8.8.0 to 8.9.0.

Release notes

Sourced from firebase-admin's releases.

Firebase Admin Node.js SDK v8.9.0

• Fixed a bug in the admin.instanceId().deleteInstanceId() API that caused errors even when the operation completed successfully in the backend.
• Upgraded the @google-cloud/firestore dependency to v3.0.0. See Firestore release notes for more details.

Cloud Messaging

• The sendMulticast() API now correctly copies the fcmOptions when sending a message to multiple recipients.

Realtime Database

• Upgraded the @firebase/database dependency to v0.5.17.

Commits

• 00892e0 Bumped version to 8.9.0 (#737)
• 513f3ac Upgraded all @firebase/* dependencies (#736)
• 29e3f06 feat: Update Firestore to 3.0 (#735)
• d3f3d91 Fixing a flaky test case (#733)
• 99d3214 Allow createCustomToken() to work with tenant-aware auth (#708)
• 050cc59 Using async project ID discovery in ProjectManagement and InstanceId (#728)
• a18dc71 Using async project ID discovery API in Auth and FCM (#724)
• a9249a6 Migrate Project Config service calls to v2. (#665)
• d9ff20e Swich tenant management service calls to the v2 endpoint. (#725)
• 8104b90 Fixing a response parse error in IID delete API (#723)
• Additional commits viewable in compare view

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[dependabot-preview]

Superseded by #39.