chore(deps): bump json_serializable and json_annotation (#351)

Bumps [json_serializable](https://github.com/google/json_serializable.dart) and [json_annotation](https://github.com/google/json_serializable.dart). These dependencies needed to be updated together.

Updates `json_serializable` from 6.7.1 to 6.8.0
- [Release notes](https://github.com/google/json_serializable.dart/releases)
- [Commits](google/json_serializable.dart@json_serializable-v6.7.1...json_serializable-v6.8.0)

Updates `json_annotation` from 4.8.1 to 4.9.0
- [Release notes](https://github.com/google/json_serializable.dart/releases)
- [Commits](google/json_serializable.dart@json_annotation-v4.8.1...json_annotation-v4.9.0)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

pubspec.lock

@@ -705,18 +705,18 @@ packages:
     dependency: "direct main"
     description:
       name: json_annotation
-      sha256: b10a7b2ff83d83c777edba3c6a0f97045ddadd56c944e1a23a3fdf43a1bf4467
+      sha256: "1ce844379ca14835a50d2f019a3099f419082cfdd231cd86a142af94dd5c6bb1"
       url: "https://pub.dev"
     source: hosted
-    version: "4.8.1"
+    version: "4.9.0"
   json_serializable:
     dependency: "direct dev"
     description:
       name: json_serializable
-      sha256: aa1f5a8912615733e0fdc7a02af03308933c93235bdc8d50d0b0c8a8ccb0b969
+      sha256: ea1432d167339ea9b5bb153f0571d0039607a873d6e04e0117af043f14a1fd4b
       url: "https://pub.dev"
     source: hosted
-    version: "6.7.1"
+    version: "6.8.0"
   leak_tracker:
     dependency: transitive
     description:

pubspec.yaml

@@ -26,7 +26,7 @@ dependencies:
   freezed_annotation: ^2.4.1 # for Freezed
   google_fonts: ^6.2.1 # From Google
   hydrated_bloc: ^9.1.5
-  json_annotation: ^4.8.1 # From Google
+  json_annotation: ^4.9.0 # From Google
   material_design_icons_flutter: ^7.0.7296
   package_info_plus: ^7.0.0 # From Flutter Community (former Google)
   path_provider: ^2.1.3 # From Google
@@ -56,7 +56,7 @@ dev_dependencies:
   hive_generator: ^2.0.1
   integration_test: # From Google
     sdk: flutter
-  json_serializable: ^6.7.1 # From Google
+  json_serializable: ^6.8.0 # From Google
   mockito: ^5.4.4 # From Google
   msix: 2.7.3 # Flutter Favorite (generating from SVG)