Update firebase dependencies

Change-Id: I2331119a1141a47862d2c3831f1616fe94b9cb27

Author: samtstern

buildSrc/src/main/kotlin/Config.kt

@@ -43,10 +43,10 @@ object Config {
         }
 
         object Firebase {
-            const val auth = "com.google.firebase:firebase-auth:19.1.0"
+            const val auth = "com.google.firebase:firebase-auth:19.2.0"
             const val core = "com.google.firebase:firebase-core:17.2.1"
             const val database = "com.google.firebase:firebase-database:19.2.0"
-            const val firestore = "com.google.firebase:firebase-firestore:21.3.0"
+            const val firestore = "com.google.firebase:firebase-firestore:21.3.1"
             const val storage = "com.google.firebase:firebase-storage:19.1.0"
         }