[MacPorts] #38173: py-gmpy2: update to 2.0.0b4

[MacPorts]

#38173: py-gmpy2: update to 2.0.0b4
---------------------------------+--------------------------------
 Reporter:  md14-macports@…      |      Owner:  macports-tickets@…
     Type:  update               |     Status:  new
 Priority:  Normal               |  Milestone:
Component:  ports                |    Version:  2.1.3
 Keywords:  haspatch maintainer  |       Port:  py-gmpy2
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 The attached patch updates py-gmpy2 to 2.0.0b4.

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Ticket URL: <https://trac.macports.org/ticket/38173>
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