[MacPorts] #40694: pgAdmin3: Update to version 1.18.0

[MacPorts]

#40694: pgAdmin3: Update to version 1.18.0
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  Reporter:  raimue@…  |      Owner:  jwa@…
      Type:  update    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.2.0
Resolution:            |   Keywords:
      Port:  pgAdmin3  |
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Comment (by mojca@…):

 I might upgrade wxWidgets to 3.0.0-RC1. Is it OK to commit this patch
 right after the upgrade to avoid changing the port twice?

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Ticket URL: <https://trac.macports.org/ticket/40694#comment:2>
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