[MacPorts] #44354: Update astropy to 0.4

[MacPorts]

#44354: Update astropy to 0.4
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 Reporter:  erik.tollerud@…  |      Owner:  macports-tickets@…
     Type:  update           |     Status:  new
 Priority:  Normal           |  Milestone:
Component:  ports            |    Version:  2.3.1
 Keywords:                   |       Port:  astropy
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 Astropy v0.4 is now available, so this just updates to that version and
 updates the cheksums.  Diff is attached.

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Ticket URL: <https://trac.macports.org/ticket/44354>
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