build: update dart constraints

Author: deandreamatias

example/ios/Podfile.lock

@@ -2,8 +2,8 @@ PODS:
   - Flutter (1.0.0)
   - phone_number (1.0.0):
     - Flutter
-    - PhoneNumberKit/PhoneNumberKitCore (= 3.3.4)
-  - PhoneNumberKit/PhoneNumberKitCore (3.3.4)
+    - PhoneNumberKit/PhoneNumberKitCore (= 3.3.8)
+  - PhoneNumberKit/PhoneNumberKitCore (3.3.8)
 
 DEPENDENCIES:
   - Flutter (from `Flutter`)

example/pubspec.yaml

@@ -4,18 +4,18 @@ publish_to: "none" # Remove this line if you wish to publish to pub.dev
 version: 1.0.0+1
 
 environment:
-  sdk: ">=2.19.0 <4.0.0"
+  sdk: ">=3.0.0 <4.0.0"
   flutter: ">=3.10.0"
 
 dependencies:
   flutter:
     sdk: flutter
-  flutter_form_builder: ^9.0.0-dev.2
+  flutter_form_builder: ^9.0.0-dev.3
   flutter_localizations:
     sdk: flutter
   form_builder_phone_field:
     path: ../
-  form_builder_validators: ^9.0.0-dev.1
+  form_builder_validators: ^9.0.0-dev.2
 
 dependency_overrides:
   intl: 0.17.0

pubspec.yaml

@@ -8,14 +8,14 @@ funding:
   - https://opencollective.com/flutter-form-builder-ecosystem
 
 environment:
-  sdk: ">=2.19.0 <4.0.0"
+  sdk: ">=3.0.0 <4.0.0"
   flutter: ">=3.10.0"
 
 dependencies:
   flutter:
     sdk: flutter
-  flutter_form_builder: ^9.0.0-dev.2
-  phone_number: ^2.0.0-dev.1
+  flutter_form_builder: ^9.0.0-dev.3
+  phone_number: ^2.0.0-dev.2
   country_pickers: ^2.0.0
 
 dev_dependencies: