[tbb-bugs] #30536 [Applications/Tor Browser]: Update go to 1.12.5

[Tor Bug Tracker & Wiki]

#30536: Update go to 1.12.5
-------------------------------------+-------------------------------------
     Reporter:  gk                   |      Owner:  tbb-team
         Type:  defect               |     Status:  new
     Priority:  Medium               |  Milestone:
    Component:  Applications/Tor     |    Version:
  Browser                            |   Keywords:  tbb-rbm, ff68-esr,
     Severity:  Normal               |  TorBrowserTeam201905
Actual Points:                       |  Parent ID:  #30491
       Points:                       |   Reviewer:
      Sponsor:                       |
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 We should update to the go 1.12 series to be able to move our macOS builds
 to Debian Stretch.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/30536>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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