fix: pass new_attrs instead of record to before_import_attributes hook
fix: pass new_attrs instead of record to before_import_attributes hook

Passing record makes the hook unable to modify imported attributes.

stephskardal/rails_admin_import,stephskardal/rails_admin_import,monkbroc/rails_admin_import,stephskardal/rails_admin_import,monkbroc/rails_admin_import,monkbroc/rails_admin_import