fix: upgrade freezed to resolve CI dependency conflict

Author: it5prasoon

pubspec.yaml

@@ -48,7 +48,7 @@ dev_dependencies:
   flutter_lints: ^3.0.0
   flutter_test:
     sdk: flutter
-  freezed: ^2.4.5
+  freezed: ^2.5.7
   mocktail: ^1.0.0
   very_good_analysis: ^5.1.0