build(deps): bump json_serializable

Bumps the freezed group with 1 update in the / directory: [json_serializable](https://github.com/google/json_serializable.dart).


Updates `json_serializable` from 6.8.0 to 6.9.0
- [Release notes](https://github.com/google/json_serializable.dart/releases)
- [Commits](google/json_serializable.dart@json_serializable-v6.8.0...json_serializable-v6.9.0)

---
updated-dependencies:
- dependency-name: json_serializable
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: freezed
...

Signed-off-by: dependabot[bot] <[email protected]>

pubspec.lock

@@ -687,10 +687,10 @@ packages:
     dependency: "direct dev"
     description:
       name: json_serializable
-      sha256: ea1432d167339ea9b5bb153f0571d0039607a873d6e04e0117af043f14a1fd4b
+      sha256: c2fcb3920cf2b6ae6845954186420fca40bc0a8abcc84903b7801f17d7050d7c
       url: "https://pub.dev"
     source: hosted
-    version: "6.8.0"
+    version: "6.9.0"
   lcov_parser:
     dependency: transitive
     description:

pubspec.yaml

@@ -72,7 +72,7 @@ dev_dependencies:
   # integration_test:
   #   sdk: flutter
   freezed_lint: ^0.0.5
-  json_serializable: ^6.8.0
+  json_serializable: ^6.9.0
   mocktail: ^1.0.4
   riverpod_generator: ^2.6.1
   riverpod_lint: ^2.6.1