Update firebase-admin in group default to the latest version 🚀

[greenkeeper]

The dependency firebase-admin was updated from 5.13.1 to 7.4.0.

This version is not covered by your current version range.

If you don’t accept this pull request, your project will work just like it did before. However, you might be missing out on a bunch of new features, fixes and/or performance improvements from the dependency update.

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[greenkeeper]

• The dependency firebase-admin was updated from 5.13.1 to 8.0.0.

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Release Notes for Firebase Admin Node.js SDK v8.0.0

• The Admin SDK no longer supports Node 6. Developers must use Node 8.13.0 or higher when deploying the Admin SDK.

Cloud Firestore

• Upgraded the Cloud Firestore client dependency to v2.0.0. This upgrade comes with a pure JS gRPC client implementation that is much smaller on disk.

Cloud Storage

• Upgraded the Cloud Storage client dependency to v2.5.0.

[greenkeeper]

• The dependency firebase-admin was updated from 5.13.1 to 8.1.0.

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[greenkeeper]

• The dependency firebase-admin was updated from 5.13.1 to 8.2.0.

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[greenkeeper]

• The dependency firebase-admin was updated from 5.13.1 to 8.3.0.

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[greenkeeper]

• The dependency firebase-admin was updated from 5.13.1 to 8.4.0.

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[greenkeeper]

• The dependency firebase-admin was updated from 5.13.1 to 8.5.0.

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[greenkeeper]

• The dependency firebase-admin was updated from 5.13.1 to 8.6.0.

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[greenkeeper]

• The dependency firebase-admin was updated from 5.13.1 to 8.6.1.

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[greenkeeper]

• The dependency firebase-admin was updated from 5.13.1 to 8.7.0.

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