Auto-update dependencies.

Author: dpebot

firestore/app/build.gradle

@@ -44,7 +44,7 @@ dependencies {
 
  // Firestore
  implementation 'com.google.firebase:firebase-core:16.0.9'
- implementation 'com.google.firebase:firebase-firestore:19.0.1'
+ implementation 'com.google.firebase:firebase-firestore:19.0.2'
 
  // Other Firebase/Play services deps
  implementation 'com.google.firebase:firebase-auth:17.0.0'