[MacPorts] #67874: mosquitto: update to 2.0.15

[MacPorts]

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

 * Attachment "macports-ports.mosquitto-2.0.16.patch" added.

 mosquitto: update to 2.0.16

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