Downgrade play-services-auth (#1655)

Author: lehcar09

build.gradle.kts

@@ -69,7 +69,8 @@ fun isBlockListed(candidate: ModuleComponentIdentifier): Boolean {
             "androidx.browser:browser",
             "com.facebook.android",
             "com.google.guava",
-            "com.github.bumptech.glide"
+            "com.github.bumptech.glide",
+            "com.google.android.gms"
     ).any { keyword ->
         keyword in candidate.toString().lowercase()
     }

firestore/app/build.gradle.kts

@@ -63,7 +63,8 @@ dependencies {
     implementation("com.google.firebase:firebase-auth")
 
     // Google Play services
-    implementation("com.google.android.gms:play-services-auth:21.2.0")
+    // Pinned to 20.7.0 as a workaround for issue https://github.com/firebase/quickstart-android/issues/1647
+    implementation("com.google.android.gms:play-services-auth:20.7.0")
 
     // FirebaseUI (for authentication)
     implementation("com.firebaseui:firebase-ui-auth:8.0.2")