[wp-trac] [WordPress Trac] #45664: Update `grunt-sass` to v3 and add `node-sass` v4

[WordPress Trac]

#45664: Update `grunt-sass` to v3 and add `node-sass` v4
------------------------------+--------------------
 Reporter:  netweb            |      Owner:  (none)
     Type:  defect (bug)      |     Status:  new
 Priority:  normal            |  Milestone:  5.0.2
Component:  Build/Test Tools  |    Version:
 Severity:  normal            |   Keywords:
  Focuses:                    |
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 Following r44219 with the update of Node.js to v10.13.0 the `grunt-sass`
 package requires an updated binary for the v4.7.2 release for Node.js
 v10.x.

 This is not available as `node-sass` v4.7.2 is ~13 months old and binaries
 were never created for this release of Node.js

 The solution is to update to a newer version of `node-sass` that includes
 a Node.js 10.x binary, in this case v4.11.0

 As `grunt-sass` no longer includes `node-sass` it is also installed and
 the `implementation` option added to the `sass` Grunt task for `grunt-
 sass` v3 compatibility.

 See also Core Slack discussion:
 https://wordpress.slack.com/archives/C02RQBWTW/p1544927491907900

 Test Pull Request: https://github.com/WordPress/wordpress-develop/pull/34
 Travis CI Build: https://travis-ci.org/WordPress/wordpress-
 develop/builds/468653051
 Travis CI PHP 5.3 Job: https://travis-ci.org/WordPress/wordpress-
 develop/jobs/468653062
 Travis CI PHP 5.2 Job: https://travis-ci.org/WordPress/wordpress-
 develop/jobs/468653063

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Ticket URL: <https://core.trac.wordpress.org/ticket/45664>
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