[MacPorts] #53162: py-astropy: update to 1.3

[MacPorts]

#53162: py-astropy: update to 1.3
----------------------+------------------------
 Reporter:  lpsinger  |      Owner:  robitaille
     Type:  update    |     Status:  new
 Priority:  Normal    |  Milestone:
Component:  ports     |    Version:
 Keywords:            |       Port:  py-astropy
----------------------+------------------------
 Astropy 1.3 is available:
 http://docs.astropy.org/en/stable/whatsnew/1.3.html

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Ticket URL: <https://trac.macports.org/ticket/53162>
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