Bump fake_async from 1.3.0 to 1.3.1 in /app_dart (#1915)

diff --git a/app_dart/pubspec.lock b/app_dart/pubspec.lock
index f78c970..d0166e6 100644
--- a/app_dart/pubspec.lock
+++ b/app_dart/pubspec.lock
@@ -203,7 +203,7 @@
       name: fake_async
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.3.0"
+    version: "1.3.1"
   file:
     dependency: "direct main"
     description:
diff --git a/app_dart/pubspec.yaml b/app_dart/pubspec.yaml
index b58c121..d122d4c 100644
--- a/app_dart/pubspec.yaml
+++ b/app_dart/pubspec.yaml
@@ -34,7 +34,7 @@
 
 dev_dependencies:
   build_runner: ^2.1.11
-  fake_async: ^1.3.0
+  fake_async: ^1.3.1
   flutter_lints: ^1.0.4
   json_serializable: ^6.1.6
   mockito: ^5.2.0