[MacPorts] #49808: update buildbot to 0.8.12

[MacPorts]

#49808: update buildbot to 0.8.12
----------------------------+---------------------
 Reporter:  ryandesign@…    |      Owner:  admin@…
     Type:  enhancement     |     Status:  new
 Priority:  Normal          |  Milestone:
Component:  server/hosting  |    Version:
 Keywords:                  |       Port:
----------------------------+---------------------
 The buildbot software on the buildbot build slaves and the master should
 probably be updated to 0.8.12.

-- 
Ticket URL: <https://trac.macports.org/ticket/49808>
MacPorts <https://www.macports.org/>
Ports system for OS X