remove unused import

Author: jrief

finder/models/file.py

@@ -10,7 +10,7 @@
 from django.core.files.storage import default_storage
 from django.db import models
 from django.template.defaultfilters import filesizeformat
-from django.utils.functional import cached_property, classproperty
+from django.utils.functional import cached_property
 from django.utils.module_loading import import_string
 from django.utils.translation import gettext_lazy as _