[tor-bugs] #20453 [Metrics/Torflow]: Update bwauth setup.sh to use tor 0.2.8.9

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#20453: Update bwauth setup.sh to use tor 0.2.8.9
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     Reporter:  teor             |      Owner:  aagbsn
         Type:  enhancement      |     Status:  new
     Priority:  Medium           |  Milestone:
    Component:  Metrics/Torflow  |    Version:
     Severity:  Normal           |   Keywords:  easy
Actual Points:                   |  Parent ID:
       Points:  0.1              |   Reviewer:
      Sponsor:                   |
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 Currently, the bwauth script uses tor 0.2.6, which is getting pretty old.
 There are performance and security improvements in 0.2.8, so we sould use
 that.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20453>
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