Bump json_serializable from 6.2.0 to 6.3.1 (#2352)
Bump json_serializable from 6.2.0 to 6.3.1 (#2352)

Bumps [json_serializable](https://github.com/google/json_serializable.dart) from 6.2.0 to 6.3.1.
- [Release notes](https://github.com/google/json_serializable.dart/releases)
- [Commits](https://github.com/google/json_serializable.dart/compare/json_serializable-v6.2.0...json_serializable-v6.3.1)

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

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
Co-authored-by: dependabot[bot] <1c358da00a777d4e9898c1280ab801e2df165188@users.noreply.github.com>
dart-lang/dart-pad,dart-lang/dart-pad,dart-lang/dart-pad,dart-lang/dart-pad