fixed flutter analyze issues introduced with new flutter version

lib/pages/scanner_page.dart

@@ -20,6 +20,7 @@ class ScannerPage extends StatelessWidget {
     await loadSettingsFromLocalJSON();
     settingsModel.initSettings();
     NotificationService().setAllNotifications();
+    if (context.mounted) {
       AwesomeDialog(
         context: context,
         dialogType: DialogType.success,
@@ -27,6 +28,7 @@ class ScannerPage extends StatelessWidget {
         desc: 'Die Einstellung wurden erfolgreich gespeichert',
       ).show();
     }
+  }
 
   @override
   Widget build(BuildContext context) {

lib/widgets/popup_for_task_done.dart

@@ -7,6 +7,7 @@ import '../services/pages_service.dart';
 
 void showTaskDonePopup(BuildContext context, Pages page) async {
   Duration duration = await getTimeTill(page);
+  if (context.mounted) {
     await showDialog(
       context: context,
       builder: (BuildContext context) {
@@ -18,6 +19,7 @@ void showTaskDonePopup(BuildContext context, Pages page) async {
         );
       },
     );
+  }
 }
 
 class TaskDonePopup extends StatelessWidget {

lib/widgets/submit_form_button.dart

@@ -17,6 +17,7 @@ class SubmitFormButton extends StatelessWidget {
       child: ElevatedButton(
         onPressed: () async {
           int success = await submitCallback();
+          if (context.mounted) {
             if (success != 0) {
               await AwesomeDialog(
                 context: context,
@@ -34,6 +35,7 @@ class SubmitFormButton extends StatelessWidget {
                 desc: 'Der Eintrag konnte nicht gespeichert werden',
               ).show();
             }
+          }
         },
         child: const Text('Speichern'),
       ),

lib/widgets/workout_timer_widget.dart

@@ -28,6 +28,7 @@ class WorkoutTimerWidget extends StatelessWidget {
         workoutProvider.saveWorkout();
         tasksProvider.setTaskDone(Pages.timer);
       }, 'Motivation nach dem Training');
+      if (context.mounted) {
         await AwesomeDialog(
           context: context,
           dialogType: DialogType.success,
@@ -36,6 +37,7 @@ class WorkoutTimerWidget extends StatelessWidget {
         ).show();
         pageProvider.swap();
       }
+    }
 
     if (workoutProvider.isPhaseComplete && !workoutProvider.isWorkoutComplete) {
       Timer(const Duration(milliseconds: 1), () => workoutProvider.nextPhase());