[MacPorts] #48775: rust: update to 1.2.0

[MacPorts]

#48775: rust: update to 1.2.0
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  Reporter:  sean@…  |      Owner:  g5pw@…
      Type:  defect  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:  2.3.3
Resolution:          |   Keywords:  haspatch
      Port:          |
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Comment (by sean@…):

 Replying to [comment:2 g5pw@…]:
 > We just need to make sure the build phase can be completed without
 internet connection (i.e. the bootstrapping compiler is not getting
 downloaded on {{{make}}}. If that is indeed true, you can go ahead and
 commit it, it looks good to me.

 That is a good question. I will test it out but it seems that rust really,
 *really*, tries to force users to download bootstrapped binaries on the
 fly. If you have any suggestions of how to avoid that, please do tell.

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Ticket URL: <https://trac.macports.org/ticket/48775#comment:3>
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