old_contents: from django.contrib.staticfiles.storage import CachedStaticFilesStorage
  
  from pipeline.storage import GZIPMixin
  
  
  class GZIPCachedStorage(GZIPMixin, CachedStaticFilesStorage):
      pass
  
new_contents: from pipeline.storage import GZIPMixin, PipelineCachedStorage
  
  
  class GZIPCachedStorage(GZIPMixin, PipelineCachedStorage):
      pass
  
subject: fix wrong static storage