build: (deps): bump flutter_foreground_task from 6.5.0 to 9.1.0

Bumps [flutter_foreground_task](https://github.com/Dev-hwang/flutter_foreground_task) from 6.5.0 to 9.1.0.
- [Changelog](https://github.com/Dev-hwang/flutter_foreground_task/blob/master/CHANGELOG.md)
- [Commits](https://github.com/Dev-hwang/flutter_foreground_task/commits)

---
updated-dependencies:
- dependency-name: flutter_foreground_task
  dependency-version: 9.1.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

lib/pages/dialer/dialer.dart

@@ -299,7 +299,9 @@ class MyCallingPage extends State<Calling> {
                 L10n.of(widget.context).foregroundServiceRunning,
           ),
           iosNotificationOptions: const IOSNotificationOptions(),
-          foregroundTaskOptions: const ForegroundTaskOptions(),
+          foregroundTaskOptions: ForegroundTaskOptions(
+            eventAction: ForegroundTaskEventAction.nothing(),
+          ),
         );
         FlutterForegroundTask.startService(
           notificationTitle: L10n.of(widget.context).screenSharingTitle,