flutter_local_notifications-v18.0.1

• Added upper bound constraints for timezone dependency. This is to allow the plugin and apps pull version 0.10.x if constraints are satisified. Future releases may bump the minimum timezone dependency but this approach is being used at the moment as version 0.10.0 of the time timezone package introduces a dependency on http package. Directly bumping the flutter_local_notifications dependency on timezone could have introduced dependency conflicts