chore(deps): bump json_serializable from 5.0.2 to 6.5.3 (#32)

* 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] <[email protected]>

* Update pubspec.yaml

* Update pubspec.yaml

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

Author: dependabot[bot]

pubspec.yaml

@@ -13,7 +13,7 @@ dependencies:
 
 dev_dependencies:
   build_runner: ^2.1.2
-  json_serializable: ^5.0.0
-  mocktail: ">=0.2.0 <0.4.0"
+  json_serializable: ^6.5.3
+  mocktail: ^0.3.0
   test: ^1.17.0
   very_good_analysis: ^2.4.0