Upgrade sprockets and sprockets rails, remove quiet_assets
What does this MR do?
Upgrade Sprockets from 3.6.0 to 3.6.2.
Changelog: https://github.com/rails/sprockets/blob/3.x/CHANGELOG.md
Upgrade Sprockets Rails from 3.0.4 to 3.1.1.
Changelog: https://github.com/rails/sprockets-rails/compare/v3.0.4...v3.1.1
quiet_assets has been seemingly abandoned, and now sprockets-rails has the feature built-in!
The config was added in this PR: https://github.com/rails/sprockets-rails/pull/355
Working towards #14286 (moved).
- Tests
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All builds are passing
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Conform by the style guides -
Branch has no merge conflicts with master
(if you do - rebase it please) -
Squashed related commits together
cc: @rspeicher