[tor-bugs] #31639 [Core Tor/Chutney]: When Travis updates the homebrew cache in their images, stop updating it in .travis.yml

[Tor Bug Tracker & Wiki]

#31639: When Travis updates the homebrew cache in their images, stop updating it in
.travis.yml
-------------------------+-------------------------------------------------
     Reporter:  teor     |      Owner:  teor
         Type:  task     |     Status:  assigned
     Priority:  Medium   |  Milestone:
    Component:  Core     |    Version:
  Tor/Chutney            |   Keywords:  merge-after-travis-image-update,
     Severity:  Normal   |  tor-hs, ipv6, single-onion, fast-fix, chutney-
                         |  ci
Actual Points:  0.1      |  Parent ID:  #30279
       Points:  0.1      |   Reviewer:
      Sponsor:           |
  Sponsor19-can          |
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 In #30279, we added a homebrew update to .travis.yml.

 This ticket removes that update.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/31639>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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