chore(deps-dev): bump postcss from 8.2.2 to 8.2.3

Author: dependabot[bot]

package-lock.json

@@ -157,7 +157,7 @@
     "npm-run-all": "^4.1.5",
     "oauth2-server": "^2.4.1",
     "open": "^7.3.1",
-    "postcss": "=8.2.2",
+    "postcss": "=8.2.3",
     "postcss-loader": "=4.1.0",
     "postcss-preset-env": "=6.7.0",
     "prettier": "^2.0.0",