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

[greenkeeper]

The dependency firebase-admin was updated from 7.3.0 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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[coveralls]

Coverage remained the same at 100.0% when pulling 4475bd4 on greenkeeper/default/firebase-admin-7.4.0 into 1a3edc0 on master.

[greenkeeper]

• The dependency firebase-admin was updated from 7.3.0 to 8.0.0.

Update to this version instead 🚀

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.