[MacPorts] #71291: remove dependency on py-pyobjc for astropy

[MacPorts]

#71291: remove dependency on py-pyobjc for astropy
--------------------------+-------------------------
  Reporter:  rbw42        |      Owner:  Schamschula
      Type:  enhancement  |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:
      Port:  py-astropy   |
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Comment (by Schamschula):

 That dependency was add in https://github.com/macports/macports-
 ports/commit/e91c6188808b723508c4654be2ca3e1638b6b3ef when version 4.2.1
 was current.

 I will have to investigate when the upstream requirement was dropped.

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Ticket URL: <https://trac.macports.org/ticket/71291#comment:2>
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