[MacPorts] #67874: mosquitto: update to 2.0.15

[MacPorts]

#67874: mosquitto: update to 2.0.15
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  Reporter:  danh1979   |      Owner:  slewsys
      Type:  update     |     Status:  assigned
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.8.1
Resolution:             |   Keywords:  haspatch
      Port:  mosquitto  |
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Comment (by danh1979):

 Looks like mosquitto already has an issue; I added a comment
 https://github.com/eclipse/mosquitto/issues/2858

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Ticket URL: <https://trac.macports.org/ticket/67874#comment:5>
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