Update sdk constraint range and update runners (#1706)

add_to_app/android_view/flutter_module_using_plugin/lib/cell.dart

@@ -15,7 +15,7 @@ void main() {
 }
 
 class Cell extends StatefulWidget {
-  const Cell({Key? key}) : super(key: key);
+  const Cell({super.key});
 
   @override
   State<StatefulWidget> createState() => _CellState();

add_to_app/android_view/flutter_module_using_plugin/lib/main.dart

@@ -70,7 +70,7 @@ class CounterModel extends ChangeNotifier {
 /// It offers two routes, one suitable for displaying as a full screen and
 /// another designed to be part of a larger UI.
 class MyApp extends StatelessWidget {
-  const MyApp({Key? key}) : super(key: key);
+  const MyApp({super.key});
 
   @override
   Widget build(BuildContext context) {
@@ -91,7 +91,7 @@ class MyApp extends StatelessWidget {
 /// Wraps [Contents] in a Material [Scaffold] so it looks correct when displayed
 /// full-screen.
 class FullScreenView extends StatelessWidget {
-  const FullScreenView({Key? key}) : super(key: key);
+  const FullScreenView({super.key});
 
   @override
   Widget build(BuildContext context) {
@@ -113,7 +113,7 @@ class FullScreenView extends StatelessWidget {
 class Contents extends StatelessWidget {
   final bool showExit;
 
-  const Contents({this.showExit = false, Key? key}) : super(key: key);
+  const Contents({this.showExit = false, super.key});
 
   @override
   Widget build(BuildContext context) {

add_to_app/android_view/flutter_module_using_plugin/pubspec.yaml

@@ -4,7 +4,7 @@ description: An example Flutter module that uses a plugin.
 version: 1.0.0+1
 
 environment:
-  sdk: '>=2.12.0 <3.0.0'
+  sdk: '>=2.19.5 <4.0.0'
 
 dependencies:
   flutter: