feat(firestore): Upgrade google-cloud-firestore to support Firestore Multi Database
#822
| Job | Run time |
|---|---|
| 54s | |
| 57s | |
| 1m 1s | |
| 1m 5s | |
| 54s | |
| 57s | |
| 1m 57s | |
| 7m 45s |