Merge pull request #9685 from nextcloud/dependabot/npm_and_yarn/build/node-sass-approx-4.9.0

Update node-sass requirement to ~4.9.0 in /build

build/package.json

@@ -24,7 +24,7 @@
     "karma-phantomjs-launcher": "*",
     "karma-viewport": "^0.4.2",
     "phantomjs-prebuilt": "*",
-    "node-sass": "~4.1.1",
+    "node-sass": "~4.9.0",
     "sinon": "<= 5.0.7"
   },
   "engine": "node >= 6.9"