chore(deps): update dependency dart to <4.0.0

example/pubspec.yaml

@@ -24,7 +24,7 @@ platforms:
   macos:
 
 environment:
-  sdk: ">=3.3.0 <4.0.0"
+  sdk: "<4.0.0"
   flutter: ">=3.22.0"
 
 # Dependencies specify other packages that your package needs in order to work.

pubspec.yaml

@@ -11,7 +11,7 @@ platforms:
   macos:
 
 environment:
-  sdk: ">=3.3.0 <4.0.0"
+  sdk: "<4.0.0"
   flutter: ">=3.22.0"
 
 dependencies:
@@ -27,7 +27,7 @@ dependencies:
 dev_dependencies:
   build_runner: ^2.4.11
   flutter_lints: any
-  ffigen: ^16.0.0
+  ffigen: ^14.0.0
   freezed: any
   json_serializable: any