[MacPorts] #55092: meld: bump to 3.18.0 (python3)

[MacPorts]

#55092: meld: bump to 3.18.0 (python3)
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  Reporter:  elelay  |      Owner:
      Type:  update  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:
Resolution:          |   Keywords:  haspatch
      Port:  meld    |
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Changes (by elelay):

 * Attachment "meld-3.18.diff" added.

 diff against 2a94add

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Ticket URL: <https://trac.macports.org/ticket/55092>
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