Merge pull request #307 from expect-Exception/renovate/postcss-8.x

chore(deps): update dependency postcss to v8.1.9

Author: KnisterPeter

package-lock.json

@@ -48,7 +48,7 @@
     "lodash": "4.17.20",
     "node-sass": "5.0.0",
     "npm-run-all": "4.1.5",
-    "postcss": "8.1.8",
+    "postcss": "8.1.9",
     "postcss-cli": "8.3.0",
     "postcss-load-config": "3.0.0",
     "rollup": "2.33.3",