Update postcss-safe-parser

Author: iansu

packages/react-scripts/package.json

@@ -68,7 +68,7 @@
     "postcss-loader": "3.0.0",
     "postcss-normalize": "8.0.1",
     "postcss-preset-env": "6.7.0",
-    "postcss-safe-parser": "4.0.2",
+    "postcss-safe-parser": "5.0.0",
     "react-app-polyfill": "^1.0.6",
     "react-dev-utils": "^10.2.1",
     "react-refresh": "^0.8.3",