build(deps-dev): bump postcss from 8.5.3 to 8.5.4 in /frontend (#4636)

Author: sandhose

frontend/package-lock.json

@@ -69,7 +69,7 @@
     "knip": "^5.59.1",
     "msw": "^2.8.7",
     "msw-storybook-addon": "^2.0.4",
-    "postcss": "^8.5.3",
+    "postcss": "^8.5.4",
     "postcss-import": "^16.1.0",
     "postcss-nesting": "^13.0.1",
     "rimraf": "^6.0.1",