Bump json_serializable from 6.3.0 to 6.3.1 in /auto_submit (#1967)

diff --git a/auto_submit/pubspec.lock b/auto_submit/pubspec.lock
index 97165a7..e22e8e2 100644
--- a/auto_submit/pubspec.lock
+++ b/auto_submit/pubspec.lock
@@ -385,7 +385,7 @@
       name: json_serializable
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "6.3.0"
+    version: "6.3.1"
   linter:
     dependency: "direct dev"
     description:
diff --git a/auto_submit/pubspec.yaml b/auto_submit/pubspec.yaml
index 9135de4..1b702fb 100644
--- a/auto_submit/pubspec.yaml
+++ b/auto_submit/pubspec.yaml
@@ -28,7 +28,7 @@
   
 dev_dependencies:
   build_runner: ^2.1.11
-  json_serializable: ^6.3.0
+  json_serializable: ^6.3.1
   linter: ^1.25.0
   lints: ^1.0.0
   mockito: ^5.0.14