Update dependency postcss to v8.0.5

Author: renovate-bot

package-lock.json

@@ -82,7 +82,7 @@
     "moment": "2.28.0",
     "npm-run-all": "4.1.5",
     "optimize-css-assets-webpack-plugin": "5.0.4",
-    "postcss": "8.0.4",
+    "postcss": "8.0.5",
     "postcss-color-function": "4.1.0",
     "postcss-import": "12.0.1",
     "postcss-loader": "4.0.2",