[MacPorts] #49614: icu: update to 57.1

[MacPorts]

#49614: icu: update to 57.1
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  Reporter:  moderndeveloperllc  |      Owner:  ryandesign
      Type:  update              |     Status:  assigned
  Priority:  Normal              |  Milestone:
 Component:  ports               |    Version:
Resolution:                      |   Keywords:
      Port:  icu                 |
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Comment (by l2dy):

 ICU 58.2 now. Note that the license has changed to the Unicode license.

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Ticket URL: <https://trac.macports.org/ticket/49614#comment:4>
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