chore(deps): bump node-sass to 4.9.3 to fix security warnings (#1483)

Author: vially

package.json

@@ -42,7 +42,7 @@
     "fs-extra": "^4.0.2",
     "glob": "^7.1.2",
     "json-loader": "^0.5.7",
-    "node-sass": "4.9.0",
+    "node-sass": "4.9.3",
     "os-name": "^2.0.1",
     "postcss": "^6.0.21",
     "proxy-middleware": "^0.15.0",