External Libraries: Update Backbone.js to 1.4.0.

Upgrade Backbone to the latest stable version. Fix some issues in Media with `listenTo` which changed in this version, see https://backbonejs.org/#changelog.

Props desrosj, priyankkpatel, pierlo.
Fixes #47478.


Built from https://develop.svn.wordpress.org/trunk@46157


git-svn-id: http://core.svn.wordpress.org/trunk@45969 1a063a9b-81f0-0310-95a4-ce76da25c4cd
This commit is contained in:
Adam Silverstein
2019-09-17 17:19:54 +00:00
parent 222b400a7d
commit 0cb3860138
8 changed files with 322 additions and 149 deletions

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