[MacPorts] #63017: py-jupyter @1.0.0 Upgrade to point to py39-jupyter

[MacPorts]

#63017: py-jupyter @1.0.0 Upgrade to point to py39-jupyter
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 Reporter:  greyhare  |      Owner:  (none)
     Type:  update    |     Status:  new
 Priority:  Normal    |  Milestone:
Component:  ports     |    Version:  2.7.1
 Keywords:            |       Port:  py-jupyter
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 `py-jupyter` points at `py38-jupyter`. `py39-jupyter` was added in October
 2020. Please consider upgrading it to point at `py39-jupyter`.

 I couldn't find an existing ticket for this, and py-jupyter is the one
 py-* port I use that still points at Python 3.8.

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Ticket URL: <https://trac.macports.org/ticket/63017>
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