[wp-trac] [WordPress Trac] #31700: Update Grunt devDependencies in package.json

[WordPress Trac]

#31700: Update Grunt devDependencies in package.json
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 Reporter:  mjbanks           |       Owner:  jorbin
     Type:  task (blessed)    |      Status:  assigned
 Priority:  normal            |   Milestone:  4.3
Component:  Build/Test Tools  |     Version:  4.2
 Severity:  normal            |  Resolution:
 Keywords:  has-patch         |     Focuses:
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Comment (by wonderboymusic):

 [attachment:31700.diff 31700.diff] is diff containing latest versions - I
 just ran `build` and `precommit` after `npm install`, all seems good.

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Ticket URL: <https://core.trac.wordpress.org/ticket/31700#comment:13>
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