Build: Update version of grunt-autoprefixer devDependency.

The update includes a new version of Autoprefixer which now supports the `ms-touch-action` prop for IE10.
Run `grunt autoprefixer:core` to re-add the missing props in media-view.css.
Built from https://develop.svn.wordpress.org/trunk@27236


git-svn-id: http://core.svn.wordpress.org/trunk@27093 1a063a9b-81f0-0310-95a4-ce76da25c4cd