[MacPorts] #37226: py-pynifti: update to use python group

[MacPorts]

#37226: py-pynifti: update to use python group
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 Reporter:  sean.michael.farley@…  |      Owner:  macports-tickets@…
     Type:  update                 |     Status:  new
 Priority:  Normal                 |  Milestone:
Component:  ports                  |    Version:  2.1.2
 Keywords:  haspatch               |       Port:  py-pynifti
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 Following the update in #37225, py-pynifti should be updated and unified
 with the python group.

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Ticket URL: <https://trac.macports.org/ticket/37226>
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