chore(deps): bump json_serializable from 5.0.2 to 6.5.3

Bumps [json_serializable](https://github.com/google/json_serializable.dart) from 5.0.2 to 6.5.3.
- [Release notes](https://github.com/google/json_serializable.dart/releases)
- [Commits](google/json_serializable.dart@json_serializable-v5.0.2...json_serializable-v6.5.3)

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

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

pubspec.yaml

@@ -13,7 +13,7 @@ dependencies:
 
 dev_dependencies:
   build_runner: ^2.1.2
-  json_serializable: ^5.0.0
+  json_serializable: ">=5.0.0 <7.0.0"
   mocktail: ">=0.2.0 <0.4.0"
   test: ^1.17.0
   very_good_analysis: ^2.4.0