[MacPorts] #51945: icu @55.1 Update icu to current 57.1

[MacPorts]

#51945: icu @55.1 Update icu to current 57.1
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 Reporter:  trm70@…  |      Owner:  macports-tickets@…
     Type:  update   |     Status:  new
 Priority:  Normal   |  Milestone:
Component:  ports    |    Version:  2.3.4
 Keywords:  update   |       Port:  icu
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 Looks like icu 57.1 is available, according to the documentation at
 https://ssl.icu-project.org/apiref/icu4c/

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Ticket URL: <https://trac.macports.org/ticket/51945>
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