added issue_tracker link to remaining packages (#2539)

Author: MaikuB

flutter_local_notifications_linux/pubspec.yaml

@@ -2,6 +2,7 @@ name: flutter_local_notifications_linux
 description: Linux implementation of the flutter_local_notifications plugin
 version: 6.0.0-dev.1
 homepage: https://github.com/MaikuB/flutter_local_notifications/tree/master/flutter_local_notifications
+issue_tracker: https://github.com/MaikuB/flutter_local_notifications/issues
 
 flutter:
   plugin:

flutter_local_notifications_platform_interface/pubspec.yaml

@@ -2,6 +2,7 @@ name: flutter_local_notifications_platform_interface
 description: A common platform interface for the flutter_local_notifications plugin.
 version: 8.1.0-dev.2
 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
 
 environment:
   sdk: ^3.4.0

flutter_local_notifications_windows/pubspec.yaml

@@ -2,6 +2,7 @@ name: flutter_local_notifications_windows
 description: Windows implementation of the flutter_local_notifications plugin
 version: 1.0.0-dev.4
 homepage: https://github.com/MaikuB/flutter_local_notifications/tree/master/flutter_local_notifications_windows
+issue_tracker: https://github.com/MaikuB/flutter_local_notifications/issues
 
 environment:
   sdk: ^3.4.0