[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:                                       |         Points:  0.1
 Reviewer:                                       |        Sponsor:
-------------------------------------------------+-------------------------
Changes (by teor):

 * sponsor:  Sponsor19-can =>
 * parent:  #30279 =>


Old description:

> In #30279, we added a homebrew update to .travis.yml.
>
> This ticket removes that update.

New description:

 In #30928, we added a homebrew update to .travis.yml for shellcheck.
 #30279 also uses an updated tor for the IPv6 v3 single onion service job.

 This ticket removes that update.

--

Comment:

 Turns out we need to revert #30928.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/31639#comment:2>
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