Support plotly >=3.8.0

[jonmmease]

According to plotly/plotly.py#1476 (comment), plotly.py 3.8.0 broke the HoloViews backend.

FYI I believe this refactor broke holoviews integration (It imports plotly.offline.offline.utils, which has moved to _plotly_utils.utils).

It should just be a matter of changing plotly.offline.offline.utils to plotly.offline.utils. These double nested packages (offline.offline) were an implementation detail that changed in the version 3.8 refactor.

I'll take a look soon...

[philippjfr]

Thanks, let's try to get this into a 1.12.2 release later this week?

[jonmmease]

Yeah, sounds good.

[github-actions]

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