prepare for 9.1.0 platform interface release

Author: MaikuB

flutter_local_notifications_platform_interface/CHANGELOG.md

@@ -1,3 +1,7 @@
+## [9.1.0]
+
+* Added `cancelAllPendingNotifications()` method for cancelling all pending notifications that have been scheduled. Thanks to the PR from [Kwon Tae Hyung](https://github.com/TaeBbong)
+
 ## [9.0.0]
 
 *  **Breaking change** bumped minimum Flutter SDK requirement to 3.22.0 and Dart SDK requirement to 3.4.0

flutter_local_notifications_platform_interface/pubspec.yaml

@@ -1,6 +1,6 @@
 name: flutter_local_notifications_platform_interface
 description: A common platform interface for the flutter_local_notifications plugin.
-version: 9.0.0
+version: 9.1.0
 homepage: https://github.com/MaikuB/flutter_local_notifications/tree/master/flutter_local_notifications_platform_interface
 issue_tracker: https://github.com/MaikuB/flutter_local_notifications/issues