Update postcss-loader from 2.1.4 to 2.1.5 in packages/react-scripts

Author: dependencies-bot

packages/react-scripts/package.json

@@ -45,7 +45,7 @@
     "kotlinx-html": "^0.6.9",
     "object-assign": "4.1.1",
     "postcss-flexbugs-fixes": "3.3.1",
-    "postcss-loader": "2.1.4",
+    "postcss-loader": "2.1.5",
     "promise": "8.0.1",
     "react-dev-utils": "^4.1.0",
     "react-error-overlay": "^2.0.2",