[MacPorts] #64766: py-pyobjc: update to 8.4 (was: py-pyobjc: update to 8.3)

[MacPorts]

#64766: py-pyobjc: update to 8.4
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  Reporter:  reneeotten  |      Owner:  danchr
      Type:  update      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  py-pyobjc   |
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Ticket URL: <https://trac.macports.org/ticket/64766#comment:2>
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