[MacPorts] #61952: py-spyder: Update to 4.2.1

[MacPorts]

#61952: py-spyder: Update to 4.2.1
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 Reporter:  mf2k    |      Owner:  reneeotten
     Type:  update  |     Status:  assigned
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:
 Keywords:          |       Port:  py-spyder
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 Please update py-spyder to 4.2.1 which [https://www.spyder-ide.org
 /#section-download officially supports Big Sur].

 Also please add a py39 sub-port if possible.

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Ticket URL: <https://trac.macports.org/ticket/61952>
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