[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:
                                                 |  needs_revision
 Priority:  Medium                               |      Milestone:
Component:  Core Tor/Chutney                     |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  merge-after-travis-image-update,     |  Actual Points:  0
  tor-hs, ipv6, single-onion, fast-fix,          |
  chutney-ci                                     |
Parent ID:  #30279                               |         Points:  0.1
 Reviewer:                                       |        Sponsor:
                                                 |  Sponsor19-can
-------------------------------------------------+-------------------------
Changes (by teor):

 * status:  assigned => needs_revision
 * actualpoints:  0.1 => 0


Comment:

 The CI will fail on this pull request, until Travis updates its macOS
 images:
 https://github.com/torproject/chutney/pull/37

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/31639#comment:1>
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