smoke: also update fake_cloud_firestore

Author: helightdev

smoke/test_firestore/pubspec.yaml

@@ -26,7 +26,7 @@ dev_dependencies:
     sdk: flutter
   build_runner: any
   dogs_generator: any
-  fake_cloud_firestore: ^2.4.8
+  fake_cloud_firestore: ^3.1.0
   flutter_lints: ^3.0.0
 
 flutter: