Bump cloud_firestore, firebase_core, firebase_auth and firebase_ui_auth (#1156)
Bump cloud_firestore, firebase_core, firebase_auth and firebase_ui_auth (#1156)

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

Updates `cloud_firestore` from 3.5.1 to 4.0.2
- [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-v4.0.2/packages/cloud_firestore)

Updates `firebase_core` from 1.24.0 to 2.1.0
- [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-v2.1.0/packages/firebase_core)

Updates `firebase_auth` from 3.11.2 to 4.0.2
- [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-v4.0.2/packages/firebase_auth)

Updates `firebase_ui_auth` from 1.0.0-dev.0 to 1.0.2
- [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_ui_auth-v1.0.2/packages)

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

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>
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