Update dependency flutter_local_notifications to v20

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
flutter_local_notifications (source)	dependencies	major	^19.1.0 → 20.0.0

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Release Notes

MaikuB/flutter_local_notifications (flutter_local_notifications)

v20.0.0

Compare Source

• Breaking change bumped minimum Flutter SDK requirement to 3.32.0 and Dart SDK requirement to 3.8.0
• Breaking changes the positional parameters in the following methods have now been converted to named parameters across all platforms. Thanks to the PR started by Kwon Tae Hyung
  • initialize()
  • show()
  • periodicallyShow()
  • periodicallyShowWithDuration()
  • cancel()
  • zonedSchedule()
• [Android] Breaking changes the positional parameters in the following methods have now been converted to named parameters
  • startForegroundService()
  • deleteNotificationChannelGroup()
  • deleteNotificationChannel()
  • getActiveNotificationMessagingStyle()
• [Linux] Breaking changes the positional parameters in the LinuxNotificationCustomHint() method have now been converted to named parameters
• [Windows] * Breaking changes the positional parameters in the following methods have now been converted to named parameters
  • showRawXml()
  • zonedScheduleRawXml()
• [Windows] Breaking changes to align with the main the plugin, the following parameters have been renamed
  • the details parameter in the show() and zonedSchedule() methods has been renamed to notificationDetails
  • the onNotificationReceived in the initialize() method has been renamed to onDidReceiveNotificationResponse
• [Windows] Breaking change removed the details parameter from the zonedScheduleRawXml() method as it was not actually used. Thanks to the PR from Levi Lesches
• [Android] updated Java compatibility version to 17
• [Android] fixed issue #​2745 to export the AndroidIcon abstract class
• Updated readme with information for developers that plan to move to use the UIScene lifecycle
• Added flutter_lints to apply linter rules

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