Update dependency postcss-preset-env to v6.7.2

Author: renovate[bot]

package-lock.json

@@ -71,7 +71,7 @@
     "postcss-flexbugs-fixes": "4.1.0",
     "postcss-loader": "3.0.0",
     "postcss-normalize": "7.0.1",
-    "postcss-preset-env": "6.7.0",
+    "postcss-preset-env": "6.7.2",
     "postcss-safe-parser": "4.0.1",
     "react-app-polyfill": "1.0.4",
     "react-dev-utils": "9.1.0",