[MacPorts] #63942: jupyter console --simple-prompt crashes after update to Python 3.9.8

[MacPorts]

#63942: jupyter console --simple-prompt crashes after update to Python 3.9.8
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 Reporter:  pietvo  |      Owner:  (none)
     Type:  defect  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:
 Keywords:          |       Port:  py39-jupyter_console
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 I updated this week from Python 3.9.7 to Python 3.9.8, on MacOS Catalina
 (10.15.7), and now
 jupyter-3.9 console --simple-prompt crashes.

 The same happens with jupyter-console-3.9 --simple-prompt

 Without the --simple-prompt it runs without problems. I need the --simple-
 prompt for use within Emacs, but it also crashes in a terminal session.
 The crash seems to be in argparse. I don't have any jupyter or ipython
 specific configuration files as far as I can see.

 **The crash can be solved by upgrading `py39-traitlets` to version 5.1.1**

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Ticket URL: <https://trac.macports.org/ticket/63942>
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