Bump json_serializable from 6.5.3 to 6.5.4

Bumps [json_serializable](https://github.com/google/json_serializable.dart) from 6.5.3 to 6.5.4.
- [Release notes](https://github.com/google/json_serializable.dart/releases)
- [Commits](google/json_serializable.dart@json_serializable-v6.5.3...json_serializable-v6.5.4)

---
updated-dependencies:
- dependency-name: json_serializable
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

pubspec.lock

@@ -602,7 +602,7 @@ packages:
       name: json_serializable
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "6.5.3"
+    version: "6.5.4"
   klizma:
     dependency: transitive
     description:

pubspec.yaml

@@ -66,7 +66,7 @@ dev_dependencies:
     sdk: flutter
   build_runner: ^2.3.2
   flutter_launcher_icons: ^0.10.0
-  json_serializable: ^6.5.3
+  json_serializable: ^6.5.4
   mockito: ^5.3.2
   network_image_mock: ^2.1.1
   flutter_lints: ^2.0.1