[MacPorts] #53598: go @1.7.4: update to 1.8

[MacPorts]

#53598: go @1.7.4: update to 1.8
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 Reporter:  l2dy    |      Owner:
     Type:  update  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:
 Keywords:          |       Port:  go
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Ticket URL: <https://trac.macports.org/ticket/53598>
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