deps: update node-sass to 4.8.3

Fixes #2762 #2237

package-lock.json

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package.json

     "file-loader": "1.1.5",
     "flow-bin": "0.57.3",
     "imports-loader": "0.7.1",
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+    "node-sass": "4.8.3",
     "precommit-hook": "3.0.0",
     "string-replace-loader": "1.3.0",
     "style-loader": "0.19.0",