[tor-bugs] #22398 [Applications/Tor Browser]: Upgrade Go to 1.8.3

[Tor Bug Tracker & Wiki]

#22398: Upgrade Go to 1.8.3
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     Reporter:  yawning                   |      Owner:  tbb-team
         Type:  task                      |     Status:  new
     Priority:  Medium                    |  Milestone:
    Component:  Applications/Tor Browser  |    Version:
     Severity:  Normal                    |   Keywords:  tbb-gitian
Actual Points:                            |  Parent ID:
       Points:                            |   Reviewer:
      Sponsor:                            |
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 Minor release notes: https://golang.org/doc/devel/release.html#go1.8.minor

 This also should include: https://github.com/golang/go/issues/20040

 Certain parts of our code do use P-256, but it's probably not exploitable.
 Updating is still a good idea.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/22398>
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