[MacPorts] #49808: update buildbot to 0.8.12

[MacPorts]

#49808: update buildbot to 0.8.12
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  Reporter:  ryandesign@…    |      Owner:  admin@…
      Type:  enhancement     |     Status:  new
  Priority:  Normal          |  Milestone:
 Component:  server/hosting  |    Version:
Resolution:                  |   Keywords:
      Port:                  |
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Comment (by ryandesign@…):

 Then maybe I'll hold off on this for now, unless there's a pressing need.

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Ticket URL: <https://trac.macports.org/ticket/49808#comment:2>
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