`DeprecationWarning` with `traitlets`

[ZhaoTianPu]

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I have observed DeprecationWarning with ipywidgets 7.7.0 and traitlets 5.2.2.post1:

DeprecationWarning: Passing unrecognized arguments to super(Layout).__init__(align='top').
object.__init__() takes exactly one argument (the instance to initialize)
This is deprecated in traitlets 4.2.This error will be raised in a future release of traitlets.
.../ipywidgets/widgets/widget.py: 477

maybe relevant to https://github.com/jupyter-widgets/ipyleaflet/issues/414 (both are the complaining of deprecation by traitlets). Should it be addressed?