Update deprecated import for werkzeug's cached_property #738
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Resolves
DeprecationWarning: The import 'werkzeug.cached_property' is deprecated and will be removed in Werkzeug 1.0. Use 'from werkzeug.utils import cached_property' instead.
raised by Werkzeug 0.19+.cached_property
has always resided in werkzeug.utils, so this is backwards-compatible.