Bump node-sass from 4.9.0 to 4.9.2 in /js

Bumps [node-sass](https://github.com/sass/node-sass) from 4.9.0 to 4.9.2.
- [Release notes](https://github.com/sass/node-sass/releases)
- [Changelog](https://github.com/sass/node-sass/blob/master/CHANGELOG.md)
- [Commits](https://github.com/sass/node-sass/compare/v4.9.0...v4.9.2)

Signed-off-by: dependabot[bot] <support@dependabot.com>

js/package.json

@@ -27,7 +27,7 @@
     "css-loader": "^0.28.9",
     "karma": "^2.0.4",
     "mini-css-extract-plugin": "^0.4.1",
-    "node-sass": "^4.5.3",
+    "node-sass": "^4.9.2",
     "webpack": "^4.14.0",
     "webpack-cli": "^3.0.8",
     "webpack-merge": "^4.1.3"