Bump firebase_core, cloud_functions, cloud_firestore and firebase_auth (#1135)
Bump firebase_core, cloud_functions, cloud_firestore and firebase_auth (#1135)

Bumps [firebase_core](https://github.com/firebase/flutterfire/tree/master/packages/firebase_core), [cloud_functions](https://github.com/firebase/flutterfire/tree/master/packages/cloud_functions), [cloud_firestore](https://github.com/firebase/flutterfire/tree/master/packages/cloud_firestore) and [firebase_auth](https://github.com/firebase/flutterfire/tree/master/packages/firebase_auth). These dependencies needed to be updated together.

Updates `firebase_core` from 1.24.0 to 2.0.0
- [Release notes](https://github.com/firebase/flutterfire/releases)
- [Changelog](https://github.com/firebase/flutterfire/blob/master/CHANGELOG.md)
- [Commits](https://github.com/firebase/flutterfire/commits/firebase_core_web-v2.0.0/packages/firebase_core)

Updates `cloud_functions` from 3.3.9 to 4.0.1
- [Release notes](https://github.com/firebase/flutterfire/releases)
- [Changelog](https://github.com/firebase/flutterfire/blob/master/CHANGELOG.md)
- [Commits](https://github.com/firebase/flutterfire/commits/cloud_functions-v4.0.1/packages/cloud_functions)

Updates `cloud_firestore` from 3.5.1 to 4.0.1
- [Release notes](https://github.com/firebase/flutterfire/releases)
- [Changelog](https://github.com/firebase/flutterfire/blob/master/CHANGELOG.md)
- [Commits](https://github.com/firebase/flutterfire/commits/cloud_firestore-v4.0.1/packages/cloud_firestore)

Updates `firebase_auth` from 3.11.2 to 4.0.1
- [Release notes](https://github.com/firebase/flutterfire/releases)
- [Changelog](https://github.com/firebase/flutterfire/blob/master/CHANGELOG.md)
- [Commits](https://github.com/firebase/flutterfire/commits/firebase_auth-v4.0.1/packages/firebase_auth)

---
updated-dependencies:
- dependency-name: firebase_core
  dependency-type: direct:production
  update-type: version-update:semver-major
- dependency-name: cloud_functions
  dependency-type: direct:production
  update-type: version-update:semver-major
- dependency-name: cloud_firestore
  dependency-type: direct:production
  update-type: version-update:semver-major
- dependency-name: firebase_auth
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
Co-authored-by: dependabot[bot] <1c358da00a777d4e9898c1280ab801e2df165188@users.noreply.github.com>
flutter/codelabs,flutter/codelabs,flutter/codelabs,flutter/codelabs,flutter/codelabs,flutter/codelabs,flutter/codelabs,flutter/codelabs,flutter/codelabs,flutter/codelabs,flutter/codelabs,flutter/codelabs