Bump json_serializable from 6.5.3 to 6.5.4 in /auto_submit (#2266)

diff --git a/auto_submit/pubspec.lock b/auto_submit/pubspec.lock
index 997c0f2..ff25325 100644
--- a/auto_submit/pubspec.lock
+++ b/auto_submit/pubspec.lock
@@ -378,7 +378,7 @@
       name: json_serializable
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "6.5.3"
+    version: "6.5.4"
   lints:
     dependency: transitive
     description:
diff --git a/auto_submit/pubspec.yaml b/auto_submit/pubspec.yaml
index 2969dc1..65c1489 100644
--- a/auto_submit/pubspec.yaml
+++ b/auto_submit/pubspec.yaml
@@ -30,7 +30,7 @@
 
 dev_dependencies:
   build_runner: ^2.3.2
-  json_serializable: ^6.5.3
+  json_serializable: ^6.5.4
   flutter_lints: ^2.0.1
   mockito: ^5.3.2
   test: ^1.21.7