Remove unneeded types (#949)

animations/lib/src/basics/08_fade_transition.dart

@@ -53,7 +53,7 @@ class _FadeTransitionDemoState extends State<FadeTransitionDemo>
       body: Center(
         child: Column(
           mainAxisSize: MainAxisSize.min,
-          children: <Widget>[
+          children: [
             FadeTransition(
               opacity: _animation,
               child: const Icon(

animations/lib/src/misc/animated_list.dart

@@ -78,7 +78,7 @@ class _AnimatedListDemoState extends State<AnimatedListDemo> {
     return Scaffold(
       appBar: AppBar(
         title: const Text('AnimatedList'),
-        actions: <Widget>[
+        actions: [
           IconButton(
             icon: const Icon(Icons.add),
             onPressed: addUser,

animations/lib/src/misc/card_swipe.dart

@@ -42,11 +42,11 @@ class _CardSwipeDemoState extends State<CardSwipeDemo> {
         padding: const EdgeInsets.all(12.0),
         child: Center(
           child: Column(
-            children: <Widget>[
+            children: [
               Expanded(
                 child: ClipRect(
                   child: Stack(
-                    children: <Widget>[
+                    children: [
                       for (final fileName in fileNames)
                         SwipeableCard(
                           imageAssetName: fileName,