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

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#30536: Update go to 1.12.5
-------------------------------------------------+-------------------------
 Reporter:  gk                                   |          Owner:  tbb-
                                                 |  team
     Type:  defect                               |         Status:
                                                 |  needs_review
 Priority:  Medium                               |      Milestone:
Component:  Applications/Tor Browser             |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  tbb-rbm, ff68-esr,                   |  Actual Points:
  TorBrowserTeam201905R                          |
Parent ID:  #30491                               |         Points:
 Reviewer:                                       |        Sponsor:
-------------------------------------------------+-------------------------
Changes (by gk):

 * keywords:  tbb-rbm, ff68-esr, TorBrowserTeam201905 => tbb-rbm, ff68-esr,
     TorBrowserTeam201905R
 * status:  new => needs_review


Comment:

 `bug_30536` (https://gitweb.torproject.org/user/gk/tor-browser-
 build.git/commit/?h=bug_30536&id=4674d8a76619eb05562d81b3f77756cce1ebfe9d)
 has the fix. Builds are still reproducible and I encountered to broken
 builds when building for the various platforms. I double-checked that the
 PTs on Windows and Linux are still working after the Go upgdade.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/30536#comment:1>
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