[wp-trac] [WordPress Trac] #34350: Update Backbone to 1.2.3 and Underscore to 1.8.3

[WordPress Trac]

#34350: Update Backbone to 1.2.3 and Underscore to 1.8.3
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 Reporter:  caseypatrickdriscoll     |       Owner:  adamsilverstein
     Type:  enhancement              |      Status:  assigned
 Priority:  normal                   |   Milestone:  4.5
Component:  External Libraries       |     Version:  4.4
 Severity:  normal                   |  Resolution:
 Keywords:  needs-testing has-patch  |     Focuses:  javascript
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Comment (by ericlewis):

 From @ocean90 on #31514:

 > [Underscore.js 1.8.2] breaks loading the Customizer and inserting a
 gallery via the media modal.

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Ticket URL: <https://core.trac.wordpress.org/ticket/34350#comment:19>
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