[wp-trac] [WordPress Trac] #47478: Update Backbone.js to 1.4.0

[WordPress Trac]

#47478: Update Backbone.js to 1.4.0
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 Reporter:  desrosj         |      Owner:  (none)
     Type:  task (blessed)  |     Status:  new
 Priority:  normal          |  Milestone:  5.3
Component:  External        |    Version:
  Libraries                 |
 Severity:  normal          |   Keywords:  needs-patch early good-first-bug
  Focuses:                  |
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 Backbone.js 1.4.0 was released on February 19, 2019.

 Core currently includes version 1.3.3 using the `package.json` file.
 However, the version indicated when the script is enqueued
 [https://core.trac.wordpress.org/browser/tags/5.2.1/src/wp-includes
 /script-loader.php#L1166 incorrectly indicates 1.2.3 is loaded].

 A full list of changes since 1.3.3 can be found here:
 https://github.com/jashkenas/backbone/compare/1.3.3...1.4.0.

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Ticket URL: <https://core.trac.wordpress.org/ticket/47478>
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