Bump node-sass from 4.5.3 to 4.14.1 in /vuetify

Bumps [node-sass](https://github.com/sass/node-sass) from 4.5.3 to 4.14.1.
- [Release notes](https://github.com/sass/node-sass/releases)
- [Changelog](https://github.com/sass/node-sass/blob/master/CHANGELOG.md)
- [Commits](sass/node-sass@v4.5.3...v4.14.1)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

vuetify/package.json

@@ -74,7 +74,7 @@
     "lolex": "2.1.2",
     "ncp": "2.0.0",
     "nightwatch": "0.9.16",
-    "node-sass": "4.5.3",
+    "node-sass": "4.14.1",
     "npm-run-all": "4.1.1",
     "opn": "5.1.0",
     "optimize-css-assets-webpack-plugin": "3.1.1",