Bump json_serializable from 6.3.1 to 6.3.2 in /app_dart (#2132)

diff --git a/app_dart/pubspec.lock b/app_dart/pubspec.lock
index 469a78a..fe87b81 100644
--- a/app_dart/pubspec.lock
+++ b/app_dart/pubspec.lock
@@ -392,7 +392,7 @@
       name: json_serializable
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "6.3.1"
+    version: "6.3.2"
   lints:
     dependency: transitive
     description:
diff --git a/app_dart/pubspec.yaml b/app_dart/pubspec.yaml
index 07f4852..4aec9b3 100644
--- a/app_dart/pubspec.yaml
+++ b/app_dart/pubspec.yaml
@@ -37,7 +37,7 @@
   build_runner: ^2.2.0
   fake_async: ^1.3.1
   flutter_lints: ^1.0.4
-  json_serializable: ^6.3.1
+  json_serializable: ^6.3.2
   mockito: ^5.2.0
   platform: ^3.1.0
   process: ^4.2.4