[wp-trac] [WordPress Trac] #64891: Update `underscore` to `1.13.8`

[WordPress Trac]

#64891: Update `underscore` to `1.13.8`
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 Reporter:  desrosj             |      Owner:  (none)
     Type:  task (blessed)      |     Status:  new
 Priority:  normal              |  Milestone:  7.0
Component:  External Libraries  |    Version:
 Severity:  normal              |   Keywords:  has-patch
  Focuses:                      |
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 A new version of the Underscore.js library is available.

 A full list of changes can be found on GitHub:
 https://github.com/jashkenas/underscore/compare/1.13.7...1.13.8.

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Ticket URL: <https://core.trac.wordpress.org/ticket/64891>
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