chore(deps): Bump json_annotation in /flutter_news_example/api

Bumps [json_annotation](https://github.com/google/json_serializable.dart) 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_annotation
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

flutter_news_example/api/pubspec.lock

@@ -277,18 +277,18 @@ 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"
  logging:
  dependency: transitive
  description:

flutter_news_example/api/pubspec.yaml

@@ -11,7 +11,7 @@ dependencies:
  dart_frog: ^1.1.0
  equatable: ^2.0.5
  http: ^1.0.0
- json_annotation: ^4.6.0
+ json_annotation: ^4.9.0
  news_blocks:
  path: packages/news_blocks