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

[MacPorts]

#71291: remove dependency on py-pyobjc for astropy
---------------------+---------------------------
 Reporter:  rbw42    |      Owner:  (none)
     Type:  request  |     Status:  new
 Priority:  Normal   |  Milestone:
Component:  ports    |    Version:
 Keywords:           |       Port:  py312-astropy
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 py312-astropy (and presumably other versions) in macports has the
 dependency on py312-pyobjc, which fails if a user doesn't have the full
 Xcode installed, but rather just the command-line tools.

 Since astropy itself doesn't have a dependency on Objective C
 (https://docs.astropy.org/en/stable/install.html#astropy-main-req), this
 seems like a spurious dependency. Please review and remove this dependency
 if possible.

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