[tor-bugs] #32758 [Core Tor/Chutney]: Travis: Update the macOS image for chutney

[Tor Bug Tracker & Wiki]

#32758: Travis: Update the macOS image for chutney
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     Reporter:  teor              |      Owner:  teor
         Type:  task              |     Status:  assigned
     Priority:  Medium            |  Milestone:
    Component:  Core Tor/Chutney  |    Version:
     Severity:  Normal            |   Keywords:  chutney-ci
Actual Points:  0                 |  Parent ID:  #32630
       Points:                    |   Reviewer:
      Sponsor:                    |
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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/32758>
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