chore: upgrade Flutter to 3.38.1 and update dependencies (#27)

- Automated Flutter upgrade from 3.35.7 to 3.38.1
- Updated dependencies (dio, http)
- Applied automatic fixes with dart fix
- Updated tracked Flutter version
- Verified with flutter analyze and flutter test

Co-authored-by: GitHub Action <action@github.com>

Author: github-actions[bot]

.flutter-version-tracked

@@ -1 +1 @@
-3.35.7
+3.38.1

pubspec.yaml

@@ -10,7 +10,7 @@ environment:
 dependencies:
   flutter:
     sdk: flutter
-  http: ^1.5.0
+  http: ^1.6.0
   dio: ^5.9.0
 
 dev_dependencies: