old_contents: import swapper
  from accelerator_abstract.models import BaseDeferrableModal
  
  
  class DeferrableModal(BaseDeferrableModal):
  
      class Meta(BaseDeferrableModal.Meta):
          swappable = swapper.swappable_setting(
              BaseDeferrableModal.Meta.app_label, 'DeferrableModal'
          )
  
new_contents: import swapper
  from accelerator_abstract.models import (
      BaseDeferrableModal,
  )
  
  
  class DeferrableModal(BaseDeferrableModal):
      class Meta(BaseDeferrableModal.Meta):
          swappable = swapper.swappable_setting(
              BaseDeferrableModal.Meta.app_label, 'DeferrableModal'
          )
  
subject: update deferrable model