Bump json_annotation from 4.6.0 to 4.7.0

Bumps [json_annotation](https://github.com/google/json_serializable.dart) from 4.6.0 to 4.7.0.
- [Release notes](https://github.com/google/json_serializable.dart/releases)
- [Commits](google/json_serializable.dart@json_annotation-v4.6.0...json_annotation-v4.7.0)

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

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

Author: dependabot[bot]

pubspec.lock

@@ -545,14 +545,14 @@ packages:
       name: json_annotation
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "4.6.0"
+    version: "4.7.0"
   json_serializable:
     dependency: "direct dev"
     description:
       name: json_serializable
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "6.3.2"
+    version: "6.4.0"
   klizma:
     dependency: transitive
     description:

pubspec.yaml

@@ -44,7 +44,7 @@ dependencies:
   http: ^0.13.5
   image_picker: ^0.8.4+9
   intl: ^0.17.0
-  json_annotation: ^4.5.0
+  json_annotation: ^4.7.0
   version: ^3.0.2
   package_info: ^2.0.2
   provider: ^6.0.3