chore(deps): bump flutter_gen from 5.3.0 to 5.3.1

Bumps [flutter_gen](https://github.com/FlutterGen/flutter_gen) from 5.3.0 to 5.3.1.
- [Release notes](https://github.com/FlutterGen/flutter_gen/releases)
- [Changelog](https://github.com/FlutterGen/flutter_gen/blob/main/CHANGELOG.md)
- [Commits](FlutterGen/flutter_gen@v5.3.0...v5.3.1)

---
updated-dependencies:
- dependency-name: flutter_gen
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

pubspec.lock

@@ -404,14 +404,14 @@ packages:
       name: flutter_gen
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "5.3.0"
+    version: "5.3.1"
   flutter_gen_core:
     dependency: transitive
     description:
       name: flutter_gen_core
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "5.3.0"
+    version: "5.3.1"
   flutter_hooks:
     dependency: "direct main"
     description:

pubspec.yaml

@@ -21,7 +21,7 @@ dependencies:
     sdk: flutter
   flutter_datetime_picker: ^1.5.1
   flutter_dotenv: ^5.0.2
-  flutter_gen: ^5.3.0
+  flutter_gen: ^5.3.1
   flutter_hooks: ^0.18.5+1
   flutter_line_sdk: ^2.3.2
   flutter_spinkit: ^5.1.0