[MacPorts] #65809: py39-nbconvert fails to build

[MacPorts]

#65809: py39-nbconvert fails to build
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 Reporter:  agl2015         |      Owner:  (none)
     Type:  defect          |     Status:  new
 Priority:  Normal          |  Milestone:
Component:  ports           |    Version:  2.7.2
 Keywords:  py39-nbconvert  |       Port:  py39-nbconvert
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 Build of py39-nbconvert on a 2014 27” iMac running the latest version of
 Catalina (10.15.7) fails when not able to retrieve css from
 https://unpkg.com/@jupyterlab/nbconvert-css@3.1.11/style/index.css. I am
 attaching the main.log file for more info.

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Ticket URL: <https://trac.macports.org/ticket/65809>
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